Contributors |
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xv | |
Preface |
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xix | |
Acknowledgments |
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xxi | |
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xxiii | |
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Chapter 1 Overview of materials and processes for lithography |
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1 | (90) |
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2 | (3) |
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1.2 Overview of Lithography Process |
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5 | (2) |
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1.3 Lithographic Exposure Sources and Processes |
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7 | (11) |
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1.3.1 Ultraviolet Lithography |
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7 | (1) |
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1.3.2 DUV Lithography---248 nm and 193 nm, Immersion, and Multiple Patterning |
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8 | (4) |
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1.3.3 Extreme Ultraviolet Lithography |
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12 | (1) |
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13 | (2) |
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1.3.5 Other Lithography Processes---Ion Beam, Scanning Probe, and Nanoimprint |
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15 | (3) |
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1.4 Characterization and Figures of Merit for Resists |
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18 | (8) |
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1.5 Resist Materials and Chemistry |
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26 | (18) |
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1.5.1 Nonchemically Amplified Resists |
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26 | (2) |
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1.5.2 Chemically Amplified Resists |
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28 | (3) |
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1.5.3 Resist Physical Properties and Etch Resistance |
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31 | (2) |
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1.5.4 Photoacid Generator Chemistry and Physics |
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33 | (5) |
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1.5.5 Molecular Resists and Inorganic Resists |
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38 | (6) |
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1.6 Challenges in Modern Resist Design |
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44 | (16) |
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1.6.1 Exposure Statistics and Shot Noise |
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45 | (1) |
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1.6.2 Photoacid Diffusion |
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46 | (5) |
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1.6.3 Resolution, Line Edge Roughness, and Sensitivity Trade-Off |
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51 | (3) |
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54 | (6) |
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60 | (31) |
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61 | (30) |
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Chapter 2 Molecular excitation and relaxation of extreme ultraviolet lithography photoresists |
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91 | (24) |
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92 | (1) |
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2.2 Extreme Ultraviolet Molecular Excitation |
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93 | (7) |
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2.2.1 Atomic Photoemission |
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94 | (1) |
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2.2.2 Extreme Ultraviolet Sensitivity |
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95 | (2) |
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2.2.3 Gas-Phase Molecular Spectroscopy |
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97 | (1) |
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2.2.4 Molecular Photoemission |
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98 | (1) |
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2.2.5 Photoemission and Shake-Up |
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98 | (2) |
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2.2.6 Molecular Shape Resonances |
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100 | (1) |
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2.3 Extreme Ultraviolet Molecular Relaxation |
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100 | (4) |
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2.3.1 Electronic Relaxation in Atoms |
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100 | (1) |
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2.3.2 Resonant Photoabsorption |
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101 | (1) |
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2.3.3 Atomic Relaxation and Fragmentation in Molecules |
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102 | (2) |
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2.4 Extreme Ultraviolet Processes in Condensed Films |
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104 | (4) |
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2.4.1 Extreme Ultraviolet Molecular Excitation in Condensed Resist Films |
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104 | (2) |
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2.4.2 Molecular Relaxation in Condensed Films |
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106 | (1) |
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2.4.3 Reaction Cascades in Condensed Films |
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107 | (1) |
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2.5 Outlook and Conclusions |
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108 | (7) |
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2.5.1 Differences in Extreme Ultraviolet Lithography and Electron Beam Lithography |
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108 | (1) |
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2.5.2 Outlook and Research Needs |
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108 | (1) |
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109 | (1) |
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109 | (6) |
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Chapter 3 Theory: electron-induced chemistry |
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115 | (20) |
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115 | (2) |
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3.2 Mechanisms for Electron-Induced Reactions |
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117 | (5) |
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3.2.1 Electron Attachment |
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117 | (3) |
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3.2.2 Electron Impact Ionization |
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120 | (1) |
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3.2.3 Electron Impact Excitation |
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121 | (1) |
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3.3 Potential Role in Lithography |
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122 | (7) |
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122 | (3) |
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125 | (2) |
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3.3.3 Rational Design of Novel Materials |
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127 | (2) |
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129 | (6) |
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130 | (5) |
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Chapter 4 EUV lithography process challenges |
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135 | (42) |
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135 | (2) |
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4.2 EUV-IL as a Characterization and Nanopatterning Tool |
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137 | (12) |
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4.2.1 Extreme Ultraviolet Interference Lithography |
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138 | (1) |
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4.2.2 Achromatic Diffraction Grating---Based EUV-IL |
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138 | (4) |
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142 | (4) |
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4.2.4 Achromatic Talbot Lithography |
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146 | (3) |
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4.3 Resist Material Challenges |
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149 | (20) |
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4.3.1 Introduction to Chemically Amplified Resists |
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149 | (1) |
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150 | (2) |
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152 | (2) |
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154 | (2) |
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156 | (2) |
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158 | (5) |
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4.3.7 PEB and Development |
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163 | (2) |
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165 | (1) |
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166 | (1) |
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4.3.10 Pattern Collapse Mitigation Strategies |
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166 | (3) |
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169 | (8) |
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170 | (7) |
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Chapter 5 EUV lithography patterning challenges |
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177 | (16) |
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5.1 Extreme Ultraviolet Lithography: Pushing Optical Lithography to the Extreme |
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177 | (6) |
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177 | (2) |
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5.1.2 Extreme Ultraviolet Optics and Mask |
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179 | (2) |
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5.1.3 Sensitivity and Source Power |
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181 | (2) |
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5.2 Extreme Ultraviolet Resist Stochastics |
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183 | (5) |
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5.2.1 Multivariate Poisson Propagation Model |
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183 | (1) |
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5.2.2 Material Versus Photon Stochastics |
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184 | (2) |
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5.2.3 Comparing Current Resist Performance to Stochastic Limits |
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186 | (2) |
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5.3 Extreme Ultraviolet Resist Progress, a Historical Perspective |
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188 | (5) |
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5.3.1 Line Edge Roughness and Sensitivity |
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188 | (1) |
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5.3.2 Resolution Progress |
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188 | (1) |
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189 | (1) |
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190 | (3) |
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Chapter 6 The chemistry and application of nonchemically amplified (non-CA) chain-scission resists |
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193 | (18) |
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193 | (3) |
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6.2 The Ceiling Temperature |
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196 | (1) |
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6.3 The Chemistry of Specific Polymer Resist Systems |
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197 | (7) |
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197 | (4) |
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201 | (1) |
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202 | (2) |
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6.3.4 Polyesters and Polycarbonates |
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204 | (1) |
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204 | (7) |
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205 | (6) |
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Chapter 7 Chemically amplified resists and acid amplifiers |
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211 | (12) |
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7.1 Extreme Ultraviolet Resists |
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211 | (2) |
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213 | (6) |
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7.2.1 EUV CAR Resist Reaction Mechanism |
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214 | (1) |
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7.2.2 Resolution-Line Width Roughness Sensitivity Tradeoff |
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215 | (2) |
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7.2.3 Positive-Tone EUV CAR Resists |
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217 | (2) |
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7.2.4 Negative-Tone Developable Extreme Ultraviolet Resists |
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219 | (1) |
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219 | (4) |
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220 | (3) |
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Chapter 8 Negative-tone organic molecular resists |
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223 | (96) |
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224 | (2) |
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226 | (13) |
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239 | (4) |
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243 | (11) |
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254 | (3) |
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257 | (6) |
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8.7 Cationic Polymerization and Cross-Linking |
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263 | (36) |
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8.7.1 General Information and Background |
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263 | (4) |
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8.7.2 FTIR Characterization of Epoxide Functionalized Molecular Resists |
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267 | (3) |
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8.7.3 Comparison of Epoxide (Oxirane) and Oxetane Functional Groups |
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270 | (3) |
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8.7.4 Effect of Number of Functional Groups and Comparison to Polymeric Resists |
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273 | (3) |
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8.7.5 Methods of Controlling Cationic Polymerization and/or Cross-Linking |
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276 | (12) |
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8.7.6 Underlayers for Epoxide Functionalized Molecular Resists |
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288 | (4) |
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8.7.7 Aqueous Base Developed Epoxide Molecular Resists |
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292 | (7) |
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299 | (9) |
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308 | (11) |
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310 | (9) |
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Chapter 9 Positive molecular resists |
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319 | (30) |
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319 | (2) |
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9.2 General Characteristics |
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321 | (1) |
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9.3 Molecular Resist Families |
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322 | (16) |
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9.3.1 Star-Shaped Molecules |
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322 | (6) |
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328 | (2) |
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9.3.3 Anthracene and Fullerene Derivatives |
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330 | (1) |
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9.3.4 Cycloaliphatic Derivatives |
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331 | (2) |
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9.3.5 Cyclic Molecules---Calixarenes and Related Structures |
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333 | (2) |
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9.3.6 Ladder Molecules---Noria |
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335 | (3) |
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9.4 Current Status, New Concepts, and Challenges |
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338 | (5) |
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343 | (6) |
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344 | (5) |
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Chapter 10 Mainstreaming inorganic metal-oxide resists for high-resolution lithography |
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349 | (28) |
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350 | (2) |
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10.1.1 Oxo-Hydroxo Nanoclusters |
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350 | (2) |
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10.2 Hydrogen Silsesquioxane |
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352 | (11) |
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353 | (3) |
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10.2.2 HSQ Exposure Mechanism |
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356 | (4) |
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10.2.3 HSQ Development Mechanism |
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360 | (2) |
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10.2.4 HSQ Overall Assessment |
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362 | (1) |
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10.3 High-Z Nanocluster Patterning |
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363 | (7) |
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10.3.1 HafSOx Solution Chemistry |
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364 | (1) |
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10.3.2 HafSOx Thin-Film Deposition, Bake, and Expose |
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365 | (1) |
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10.3.3 HafSOx Development |
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366 | (1) |
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367 | (1) |
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10.3.5 Advances of Lithographic Resolution in High-Z Metal-Oxide Resists |
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368 | (2) |
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10.4 Metal-Oxide Nanocluster Patterning Materials---Present and Future |
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370 | (7) |
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371 | (6) |
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Chapter 11 Molecular organometallic resists for EUV (MORE) |
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377 | (44) |
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378 | (1) |
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11.2 Survey of Simple Metal Complexes |
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379 | (1) |
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380 | (5) |
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11.3.1 Synthesis of Bismuth-Phenyl Oligomers |
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381 | (3) |
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11.3.2 Approach 1: Noncatalytic Acid Cleavage of Bismuth-Phenyl Oligomers |
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384 | (1) |
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11.3.3 Approach 2: Oxidized Bismuth-Phenyl Oligomers |
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384 | (1) |
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11.3.4 Outgassing Results for Acetate Material |
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385 | (1) |
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11.4 Palladium and Platinum Compounds |
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385 | (9) |
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11.4.1 Platinum and Palladium Complexes With Known Photosensitive Moieties: Azide, Carbonate, and Oxalate |
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387 | (7) |
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394 | (16) |
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394 | (7) |
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401 | (9) |
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11.6 Metal Oxalate Complexes |
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410 | (3) |
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410 | (1) |
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410 | (2) |
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412 | (1) |
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11.6.4 Optimization Studies and Champion Results |
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412 | (1) |
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413 | (8) |
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413 | (1) |
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11.7.2 Palladium and Platinum |
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414 | (1) |
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414 | (1) |
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414 | (1) |
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11.7.5 Chromium, Iron, and Cobalt |
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414 | (1) |
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415 | (6) |
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Chapter 12 SML electron beam resist: ultra-high aspect ratio nanolithography |
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421 | (26) |
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421 | (2) |
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12.2 Photomask Production |
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423 | (1) |
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12.3 Electron Beam Resist Optical Properties |
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424 | (7) |
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12.4 SML2000 Electron Beam Performance |
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431 | (7) |
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12.5 Pushing the Resolution Limits |
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438 | (6) |
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444 | (3) |
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445 | (1) |
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445 | (2) |
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Chapter 13 Alternative resist approaches |
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447 | (32) |
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447 | (1) |
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13.2 Novel Approaches for EUV |
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448 | (26) |
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450 | (3) |
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13.2.2 Low-Absorbance Approaches |
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453 | (8) |
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13.2.3 High-Absorbance Approaches |
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461 | (7) |
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13.2.4 Organic-Metal Oxide Composites |
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468 | (6) |
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474 | (5) |
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474 | (5) |
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Chapter 14 Next generation lithography---the rise of unconventional methods? |
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479 | (18) |
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14.1 The Ultimate Driving Force: Moore's Law |
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479 | (4) |
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14.1.1 The Semiconductor Industry: Where We are and Where We are Going? |
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480 | (1) |
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14.1.2 The Workhorse of the Semiconductor Industry and Its Physical Limitations |
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481 | (2) |
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14.2 Beyond Optical: State-of-the-Art in NGL |
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483 | (4) |
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14.2.1 X-Ray and EUV Lithography |
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483 | (1) |
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14.2.2 Nanoimprint Lithography |
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484 | (1) |
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14.2.3 Maskless Lithography (ML2) |
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485 | (2) |
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14.3 Beyond Scaling---Post Si-MOSFET/CMOS Technology |
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487 | (10) |
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489 | (8) |
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Chapter 15 Tip-based nanolithography methods and materials |
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497 | (46) |
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15.1 Scanning Probe Lithography |
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498 | (6) |
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15.1.1 Scanning Probe Microscopy and Scanning Probe Lithography Setup |
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498 | (6) |
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15.2 Scanning Probe Lithography Classification |
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504 | (12) |
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15.2.1 Force-Induced Interactions |
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504 | (3) |
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15.2.2 Heat-Induced Interactions |
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507 | (1) |
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15.2.3 Photon-, Ink-, Catalytic-Induced Interactions |
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508 | (1) |
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15.2.4 Electric-Field---Induced Interactions |
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509 | (7) |
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15.3 Increasing the Efficiency and Throughput of Scanning Probe Lithography |
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516 | (13) |
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15.3.1 Mix-and-Match and Step-and-Repeat Strategies |
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518 | (8) |
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15.3.2 Multicantilever Arrays by Using Active Cantilever Systems |
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526 | (3) |
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529 | (14) |
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529 | (1) |
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530 | (13) |
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Chapter 16 Thermal scanning probe lithography |
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543 | (20) |
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543 | (1) |
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16.2 Advantages of Thermal Scanning Probe Lithography |
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544 | (3) |
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16.3 Patterning With Thermal Scanning Probe Lithography |
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547 | (3) |
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547 | (1) |
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548 | (1) |
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16.3.3 Direct Evaporation of Other Resist Types |
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549 | (1) |
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16.3.4 Thermochemical Reactions |
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549 | (1) |
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16.3.5 Crosslinking Reactions |
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550 | (1) |
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16.4 Pattern Transfer Processes From PPA |
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550 | (8) |
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16.4.1 High-Resolution Etch Transfer |
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551 | (1) |
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552 | (2) |
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16.4.3 Three-Dimensional Transfer |
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554 | (2) |
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16.4.4 Mass Replication Techniques |
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556 | (1) |
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16.4.5 Guided Particle Assembly |
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557 | (1) |
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558 | (5) |
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558 | (5) |
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Chapter 17 Scanning helium ion beam lithography |
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563 | (32) |
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563 | (2) |
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17.2 Helium Ion Beam System and Ion Solid Interactions |
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565 | (12) |
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17.2.1 Working Principle of the Gas Field Ion Source |
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565 | (3) |
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17.2.2 Ion-Solid Interactions |
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568 | (9) |
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17.3 Exposure of Resists in Helium Ion Beam Lithography |
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577 | (13) |
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17.3.1 General Procedure and Considerations for HIBL |
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577 | (1) |
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17.3.2 HIBL With PMMA and HSQ |
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578 | (9) |
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17.3.3 HIBL With Fullerene Derivative Molecular Resist |
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587 | (2) |
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17.3.4 Evaluation of EUV Resists Using HIBL |
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589 | (1) |
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17.4 Conclusions and Outlook |
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590 | (5) |
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591 | (4) |
Index |
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595 | |