| Acknowledgement |
|
v | |
| About the Authors |
|
vii | |
| 1 Introduction |
|
1 | (6) |
| 2 Carrier Physics and Junction Electrostatics |
|
7 | (74) |
|
|
|
7 | (1) |
|
2.2 Crystal Structure and Energy Bands |
|
|
7 | (7) |
|
2.3 Carrier Concentration and Fermi Level |
|
|
14 | (7) |
|
2.3.1 Intrinsic Semiconductor |
|
|
17 | (1) |
|
2.3.2 Extrinsic Semiconductor |
|
|
18 | (3) |
|
|
|
21 | (7) |
|
|
|
22 | (4) |
|
|
|
26 | (2) |
|
|
|
28 | (1) |
|
|
|
28 | (3) |
|
2.6 Carrier Recombination |
|
|
31 | (17) |
|
|
|
37 | (2) |
|
2.6.2 Carrier Lifetime Control |
|
|
39 | (6) |
|
2.6.3 Auger Recombination |
|
|
45 | (3) |
|
2.7 Basic Equations in Semiconductor |
|
|
48 | (2) |
|
2.8 p-n Junction Electrostatics |
|
|
50 | (4) |
|
2.9 Junction Breakdown Phenomena |
|
|
54 | (7) |
|
2.9.1 Abrupt pt-n Junction |
|
|
58 | (1) |
|
2.9.2 Linearly Graded Junction |
|
|
59 | (2) |
|
2.10 Punchthrough Phenomenon |
|
|
61 | (3) |
|
2.11 Junction Termination |
|
|
64 | (12) |
|
2.11.1 Cylindrical Junction |
|
|
65 | (3) |
|
2.11.2 Spherical Junction |
|
|
68 | (1) |
|
2.11.3 Floating Field Ring |
|
|
68 | (2) |
|
2.11.4 Etched Contour Termination |
|
|
70 | (1) |
|
2.11.5 Bevelled Edge Termination |
|
|
71 | (2) |
|
|
|
73 | (1) |
|
2.11.7 Junction Termination Extension |
|
|
74 | (1) |
|
2.11.8 SIPOS (Semi-insulating Polycrystalline Silicon) Termination |
|
|
75 | (1) |
|
|
|
76 | (1) |
|
|
|
76 | (5) |
| 3 Bipolar Junction Diode |
|
81 | (62) |
|
|
|
81 | (2) |
|
3.2 Basic Junction Diode Theory |
|
|
83 | (7) |
|
|
|
83 | (3) |
|
|
|
86 | (1) |
|
3.2.3 Junction Capacitance |
|
|
87 | (3) |
|
3.3 High-Voltage p+-n- -n+ Diode |
|
|
90 | (15) |
|
|
|
91 | (7) |
|
|
|
98 | (1) |
|
|
|
99 | (6) |
|
3.4 Schottky Barrier Diode |
|
|
105 | (8) |
|
|
|
107 | (3) |
|
|
|
110 | (3) |
|
|
|
113 | (3) |
|
3.6 GaAs and SiC Power Diodes |
|
|
116 | (5) |
|
3.7 Switching Characteristics |
|
|
121 | (7) |
|
|
|
122 | (2) |
|
|
|
124 | (4) |
|
3.8 MPS (Merged p-i-n/Schottky) Diode |
|
|
128 | (2) |
|
3.9 Smart-Power Integrated Synchronous Rectifier |
|
|
130 | (8) |
|
|
|
138 | (1) |
|
|
|
138 | (5) |
| 4 Power Metal-Oxide-Semiconductor Field-Effect Transistor |
|
143 | (48) |
|
|
|
143 | (1) |
|
|
|
144 | (8) |
|
|
|
146 | (1) |
|
|
|
146 | (1) |
|
|
|
146 | (1) |
|
|
|
147 | (2) |
|
|
|
149 | (2) |
|
|
|
151 | (1) |
|
4.3 Static Characteristics |
|
|
152 | (8) |
|
4.3.1 Linear Region Operation |
|
|
154 | (4) |
|
4.3.2 Saturation Region Operation |
|
|
158 | (1) |
|
4.3.3 Mobility Degradation |
|
|
159 | (1) |
|
|
|
160 | (1) |
|
4.4 Switching Characteristics |
|
|
160 | (8) |
|
|
|
161 | (2) |
|
|
|
163 | (3) |
|
|
|
166 | (1) |
|
4.4.4 High-Frequency Operation |
|
|
167 | (1) |
|
4.4.5 Parasitic Body Diode |
|
|
168 | (1) |
|
|
|
168 | (2) |
|
4.6 Dummy-Gated Structure |
|
|
170 | (2) |
|
4.7 Folded Gate Structure |
|
|
172 | (1) |
|
4.8 Lateral Radio Frequency (RF) Power MOSFET |
|
|
173 | (8) |
|
|
|
174 | (1) |
|
4.8.2 Stepped Lateral Double Diffusion |
|
|
175 | (1) |
|
4.8.3 Partial Silicon-on-Insulator Platform |
|
|
175 | (2) |
|
4.8.4 Partial SOI Platform Formation |
|
|
177 | (4) |
|
4.9 Parallel and Series Operations |
|
|
181 | (2) |
|
|
|
183 | (3) |
|
|
|
186 | (5) |
| 5 Insulated-Gate Bipolar Transistor |
|
191 | (58) |
|
|
|
191 | (2) |
|
5.2 Device Structure and Current-Voltage Characteristics |
|
|
193 | (6) |
|
5.2.1 Forward Conduction Characteristics |
|
|
195 | (4) |
|
|
|
199 | (1) |
|
5.3 Switching Characteristics |
|
|
199 | (2) |
|
|
|
201 | (4) |
|
|
|
205 | (1) |
|
5.6 Series and Parallel Operations |
|
|
206 | (1) |
|
5.7 Device Operations under Soft Switching |
|
|
207 | (3) |
|
5.7.1 Dual-Gate IGBT for ZV Soft Switching |
|
|
208 | (2) |
|
5.8 Lateral IGBT Structure |
|
|
210 | (2) |
|
5.9 Integrated Current Sensor |
|
|
212 | (8) |
|
5.9.1 Fabrication Aspects |
|
|
216 | (1) |
|
|
|
217 | (3) |
|
|
|
220 | (3) |
|
5.11 Overcurrent Protection |
|
|
223 | (7) |
|
5.12 Vertical IGBT Fabrication Process |
|
|
230 | (1) |
|
5.13 Related MOS-Bipolar Structures |
|
|
231 | (13) |
|
5.13.1 Emitter Switched Thyristor (EST) |
|
|
231 | (6) |
|
5.13.2 Base-Resistance-Controlled Thyristor (BRT) |
|
|
237 | (5) |
|
5.13.3 Injection-Enhanced Insulated-Gate Bipolar Transistor (IEGT) |
|
|
242 | (1) |
|
5.13.4 MOS-Controlled Thyristor (MCT) |
|
|
243 | (1) |
|
|
|
244 | (5) |
| 6 Superjunction Structures |
|
249 | (60) |
|
|
|
249 | (1) |
|
6.2 The Unipolar Ideal Silicon Limit |
|
|
250 | (3) |
|
6.3 The Superjunction Structure |
|
|
253 | (10) |
|
6.3.1 SJ Electric Field Profiles |
|
|
255 | (4) |
|
|
|
259 | (2) |
|
6.3.3 Fabrication Technologies |
|
|
261 | (2) |
|
6.4 Practical SJ Performance |
|
|
263 | (13) |
|
6.4.1 The Practical Concentration Equation |
|
|
274 | (1) |
|
6.4.2 Practical SJ Performance Equation |
|
|
275 | (1) |
|
6.5 Polysilicon Flanked VDMOS (PF VDMOS) |
|
|
276 | (4) |
|
6.6 Oxide Bypassed (OB) SJ MOSFET |
|
|
280 | (8) |
|
6.7 Graded Doping in Drift Region |
|
|
288 | (1) |
|
6.8 Tunable Oxide Bypassed MOSFETs |
|
|
289 | (7) |
|
6.9 Gradient Oxide Bypassed (GOB) Structure |
|
|
296 | (4) |
|
6.10 Lateral Superjunction Power MOSFET |
|
|
300 | (5) |
|
6.10.1 Device Process Technology |
|
|
303 | (2) |
|
|
|
305 | (4) |
| 7 Silicon Carbide Power Devices |
|
309 | (50) |
|
|
|
309 | (1) |
|
7.2 SiC Material Properties and Processing Technologies |
|
|
310 | (9) |
|
7.2.1 Material Properties |
|
|
311 | (3) |
|
7.2.2 Processing Technologies |
|
|
314 | (5) |
|
7.3 High Voltage Designs for SiC Devices |
|
|
319 | (5) |
|
7.3.1 Drift Region and Ideal Breakdown Voltage |
|
|
319 | (2) |
|
7.3.2 Edge Termination for SiC Power Devices |
|
|
321 | (3) |
|
|
|
324 | (5) |
|
7.4.1 SiC Schottky Barrier Diodes |
|
|
324 | (3) |
|
|
|
327 | (2) |
|
7.5 SiC Unipolar Switches |
|
|
329 | (12) |
|
|
|
329 | (10) |
|
|
|
339 | (2) |
|
|
|
341 | (6) |
|
7.6.1 SiC BJTs and Thyristors |
|
|
342 | (4) |
|
|
|
346 | (1) |
|
|
|
347 | (2) |
|
|
|
349 | (10) |
| 8 Gallium Nitride Power Devices |
|
359 | (64) |
|
|
|
359 | (2) |
|
8.2 AlGaN/GaN and InGaN/GaN Heterojunction Configurations |
|
|
361 | (11) |
|
8.2.1 Theoretical Calculations of Polarization Effects |
|
|
361 | (6) |
|
8.2.2 Calculation of 2DEG Sheet Carrier Density |
|
|
367 | (3) |
|
8.2.3 Calculation of Critical Thickness of Strained Layer |
|
|
370 | (2) |
|
8.3 Simulation of GaN HEMTs |
|
|
372 | (6) |
|
8.3.1 Fabrication Induced Trap Charges |
|
|
372 | (3) |
|
8.3.2 Normally-off HEMT Device with Field Plates |
|
|
375 | (3) |
|
8.4 Current Collapse in GaN HEMT |
|
|
378 | (11) |
|
8.5 Reduction of Current Collapse with Gate Field Plate |
|
|
389 | (3) |
|
|
|
392 | (1) |
|
8.7 Normally-off Operations in AlGaN/GaN HEMTs |
|
|
393 | (6) |
|
8.8 High Threshold Voltage Normally-off MIS-HEMTs |
|
|
399 | (6) |
|
8.9 Argon Pre-processed Fluorination Plasma Treatment |
|
|
405 | (5) |
|
8.10 High Temperature Threshold Voltage Stability |
|
|
410 | (5) |
|
8.11 GaN-Based Inverter Configuration |
|
|
415 | (4) |
|
|
|
419 | (1) |
|
|
|
420 | (3) |
| 9 Fabrication and Modeling of Power Devices |
|
423 | (28) |
|
|
|
423 | (16) |
|
|
|
423 | (3) |
|
|
|
426 | (1) |
|
|
|
427 | (2) |
|
|
|
429 | (3) |
|
|
|
432 | (4) |
|
|
|
436 | (1) |
|
|
|
436 | (3) |
|
9.2 Basic Models for the Simulation of Unit Process Steps |
|
|
439 | (6) |
|
9.2.1 Thermal Oxidation Models |
|
|
439 | (2) |
|
|
|
441 | (1) |
|
9.2.3 Ion Implantation Models |
|
|
442 | (1) |
|
9.2.4 Optical Lithography |
|
|
443 | (1) |
|
|
|
444 | (1) |
|
|
|
445 | (1) |
|
9.3 Advances in the Processes for Power Devices |
|
|
445 | (5) |
|
9.3.1 Modifications to Improve Gate Oxide Reliability and Breakdown Performance |
|
|
445 | (2) |
|
9.3.2 Use of Selective Epitaxial Growth for Performance Enhancement |
|
|
447 | (3) |
|
|
|
450 | (1) |
| 10 Practical Case Studies in Silicon Power Devices |
|
451 | (70) |
|
10.1 Case Study I: Process Integration and Design of PFVDMOS |
|
|
451 | (32) |
|
10.1.1 Process Integration to Implement PFVDMOS Device |
|
|
452 | (3) |
|
10.1.2 Simulation and Process Parameter Determination of PFVDMOS Device |
|
|
455 | (13) |
|
10.1.3 Experimental Results |
|
|
468 | (15) |
|
10.2 Case Study II: Tunable Oxide Bypass MOSFETS |
|
|
483 | (35) |
|
10.2.1 100 V TOBUMOS Fabrication |
|
|
484 | (1) |
|
10.2.2 Simulation on 100 V TOBUMOS |
|
|
485 | (2) |
|
10.2.3 Process Flow and Cross-Sections |
|
|
487 | (9) |
|
10.2.4 Key Precautions in TOBUMOS Fabrication |
|
|
496 | (4) |
|
10.2.5 Device Structure and Mask Layout Design |
|
|
500 | (3) |
|
10.2.6 Mask Floorplan and Splits for 100 V TOBUMOS Fabrication |
|
|
503 | (2) |
|
10.2.7 100 V TOBUMOS Measurement Results and Discussions |
|
|
505 | (5) |
|
10.2.8 Investigations for Off State Failure |
|
|
510 | (6) |
|
10.2.9 Measurement Results on New Modified TOBUMOS Fabrication |
|
|
516 | (2) |
|
|
|
518 | (3) |
| 11 Practical Case Studies in Wide Bandgap Power Devices |
|
521 | (66) |
|
11.1 Case Study I: Process Integration and Design of SiC DIMOSFET |
|
|
521 | (28) |
|
11.1.1 Process Integration to Self-Aligned SiC DIMOSFET |
|
|
521 | (2) |
|
11.1.2 Simulation of a Cell Structure for a Self-Aligned SiC DIMOSFET |
|
|
523 | (15) |
|
11.1.3 Experimental Results |
|
|
538 | (11) |
|
11.2 Case Study II: Design of Normally-off GaN HEMT for Power Electronics Applications |
|
|
549 | (33) |
|
11.2.1 Fabrication of Partial AlGaN recess Metal-Insulator-Semiconductor (MIS) HEMT |
|
|
550 | (5) |
|
11.2.2 Innovative Normally-off (MIS) HEMT Structure Using Multi-fluorinated Gate Stack |
|
|
555 | (3) |
|
11.2.3 Obtaining Normally-off (MIS) HEMT Structure Capable of Operating at High Temperature Using Ar and Single F-Treatment |
|
|
558 | (24) |
|
11.2.4 Concluding Remarks |
|
|
582 | (1) |
|
|
|
582 | (5) |
| Index |
|
587 | |