A. Zhang, Qi Zhou, Chao Yang, Yuanyuan Shi, Changxu Dong, Tong Liu, Yijun Shi, Wanjun Chen, Zhaoji Li, Bo Zhang
{"title":"Novel AlGaN/GaN SBDs with nanoscale multi-channel for gradient 2DEG modulation","authors":"A. Zhang, Qi Zhou, Chao Yang, Yuanyuan Shi, Changxu Dong, Tong Liu, Yijun Shi, Wanjun Chen, Zhaoji Li, Bo Zhang","doi":"10.1109/ISPSD.2018.8393638","DOIUrl":"https://doi.org/10.1109/ISPSD.2018.8393638","url":null,"abstract":"Novel lateral AlGaN/GaN Schottky barrier diodes (SBDs) featuring nanoscale multi-channel for gradient two-dimensional electron gas (2DEG) modulation have been proposed and successfully demonstrated on silicon substrates. The 5 °C low temperature plasma etching with improved resolution is developed to form the nanoscale trenches. Due to the aspect ratio dependent etching, the trenches with different widths and depths can be fabricated in one step etching process. Owing to the small discontinuous etching area of the nanoscale trenches, the lattice strain presented in the original AlGaN/GaN heterostructure is marginally modified. Hence the piezoelectric polarization induced 2DEG can be well maintained and gradually modulated beneath the Schottky contact, which is beneficial for a low turn-on ( VT) and high breakdown voltage (BV). The fabricated SBDs exhibit uniform VT of 0.61±0.02 V and maximum BV of 1317 V. The proposed nanoscale multi-channel structure can also be applied in the gate structure design for normally-off GaN high electron mobility transistors (HEMTs) as well as edge termination for electric-field distribution optimization of power devices.","PeriodicalId":166809,"journal":{"name":"2018 IEEE 30th International Symposium on Power Semiconductor Devices and ICs (ISPSD)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126089396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Influence of the off-state gate-source voltage on the transient drain current response of SiC MOSFETs","authors":"Christian Unger, M. Pfost","doi":"10.1109/ISPSD.2018.8393599","DOIUrl":"https://doi.org/10.1109/ISPSD.2018.8393599","url":null,"abstract":"In this work we investigate the effect of negative off-state gate-source voltages on SiC MOSFETs. With increasingly negative VGS, Off voltages, a more pronounced drain current over-shoot immediately after turn-on is observed. This effect is most noticeable in saturation, where the drain current is determined primarily by the channel. The phenomenon is attributed to positively charged oxide- and interface-traps that temporarily enhance the inversion charge in the channel before they are gradually neutralized. The amount of charged traps depends on the position of the valence band edge in accumulation, hence the VGS, Off dependence. Two distinct components with very different time constants are observed.","PeriodicalId":166809,"journal":{"name":"2018 IEEE 30th International Symposium on Power Semiconductor Devices and ICs (ISPSD)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115409134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Yen, F. Hsu, C. Hung, Chwan-Ying Lee, L. Lee, Yafang Li, K. Chu
{"title":"Avalanche ruggedness and reverse-bias reliability of SiC MOSFET with integrated junction barrier controlled Schottky rectifier","authors":"C. Yen, F. Hsu, C. Hung, Chwan-Ying Lee, L. Lee, Yafang Li, K. Chu","doi":"10.1109/ISPSD.2018.8393601","DOIUrl":"https://doi.org/10.1109/ISPSD.2018.8393601","url":null,"abstract":"A process and a scalable structure were used to implement the SiC MOSFET with integrated junction barrier controlled Schottky diode (JMOS) without area penalty. The JMOS could provide similar on-resistance and drain-source breakdown voltage with the same chip size as the standard double-implanted MOSFET (DMOS). The ideal factor and Schottky barrier height of integrated Schottky diode were 1.13 and 1.22eV for 650V JMOS and 1.11 and 1.27eV for 1200V JMOS. The diode forward voltage drop of JMOS were lower than DMOS when the diode forward current were smaller than 44A for 650V JMOS and 58A for 1200V JMOS. The reverse recovery charge of 650V and 1200V JMOS at 150°C were 22% and 53% lower than corresponding DMOS. The peak reverse recovery current of 650V and 1200V JMOS were 26% and 40% lower than corresponding DMOS. The output capacitance of JMOS were also lower than DMOS. The avalanche energy (Eas) of 650V and 1200V JMOS were 1682mJ and 1270mJ, smaller than the corresponding DMOS, but a 17.2 J/cm2 Eas is still superior to silicon counterparts. The results of diode forward current stress, diode surge current test and 1000 hours high temperature reverse bias test demonstrated that JMOS is reliable.","PeriodicalId":166809,"journal":{"name":"2018 IEEE 30th International Symposium on Power Semiconductor Devices and ICs (ISPSD)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130408632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Sandow, P. Brandt, H. Felsl, F. Niedernostheide, F. Pfirsch, H. Schulze, A. Stegner, F. Umbach, F. Santos, W. Wagner
{"title":"IGBT with superior long-term switching behavior by asymmetric trench oxide","authors":"C. Sandow, P. Brandt, H. Felsl, F. Niedernostheide, F. Pfirsch, H. Schulze, A. Stegner, F. Umbach, F. Santos, W. Wagner","doi":"10.1109/ISPSD.2018.8393593","DOIUrl":"https://doi.org/10.1109/ISPSD.2018.8393593","url":null,"abstract":"The continued shrinking of IGBT chips calls for new design approaches to ensure reliable and stable switching operation during the chip lifetime. We demonstrate a new asymmetric gate oxide concept with a designed variable thickness that leads to stable long-term operation in trench IGBTs and reduces the switching delay and the gate charge without sacrificing electrical performance. These claims are supported by longer-term repetitive switching experiments as well as TCAD simulations on a calibrated model.","PeriodicalId":166809,"journal":{"name":"2018 IEEE 30th International Symposium on Power Semiconductor Devices and ICs (ISPSD)","volume":"27 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130646537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. Boksteen, C. Papadopoulos, D. Prindle, A. Kopta, C. Corvasce
{"title":"6.5 kV field shielded anode (FSA) diode concept with 150C maximum operational temperature capability","authors":"B. Boksteen, C. Papadopoulos, D. Prindle, A. Kopta, C. Corvasce","doi":"10.1109/ISPSD.2018.8393594","DOIUrl":"https://doi.org/10.1109/ISPSD.2018.8393594","url":null,"abstract":"In this paper we present a low leakage current 6.5 kV field shielded anode (FSA) diode with high forward bias safe operating area (FBSOA) ruggedness capable of reliable operation up to 150 °C. This is achieved through optimization of the junction termination, the resistive zone (RZ) between this area and the active region and selective shallow ion irradiation for local lifetime control. As a result, the diode maintains or exceeds the softness, surge current and FBSOA capabilities set by the 6.5 kV carrier axial lifetime (CAL) diode, while also reducing its (125 °C) leakage current by more than 4 times achieving magnitudes typically associated with low leakage emitter efficiency control (EMCON) based concepts.","PeriodicalId":166809,"journal":{"name":"2018 IEEE 30th International Symposium on Power Semiconductor Devices and ICs (ISPSD)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133230458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"645 V quasi-vertical GaN power transistors on silicon substrates","authors":"Chao Liu, R. Khadar, E. Matioli","doi":"10.1109/ISPSD.2018.8393647","DOIUrl":"https://doi.org/10.1109/ISPSD.2018.8393647","url":null,"abstract":"In this paper, we present GaN-on-Si vertical transistors consisting of a 6.7 μm thick n-p-n heterostructure grown on 6-inch silicon substrates by MOCVD. The fabricated vertical trench gate MOSFETs exhibited E-mode operation with a threshold voltage of 3.3 V and an on/off ratio of over 108. A specific on-resistance of 6.8 mň-cm2 and a high off-state breakdown voltage of 645 V were achieved. These results show the great potential of the GaN-on-Si platform for the next generation of cost-effective power electronics.","PeriodicalId":166809,"journal":{"name":"2018 IEEE 30th International Symposium on Power Semiconductor Devices and ICs (ISPSD)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116703297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Siyang Liu, Zhichao Li, Wangran Wu, Weifeng Sun, Shulang Ma, Yuwei Liu, Wei Su, Xiaohong Liu
{"title":"Duty-cycle-accelerated hot-carrier degradation and lifetime evaluation for 700V lateral DMOS","authors":"Siyang Liu, Zhichao Li, Wangran Wu, Weifeng Sun, Shulang Ma, Yuwei Liu, Wei Su, Xiaohong Liu","doi":"10.1109/ISPSD.2018.8393667","DOIUrl":"https://doi.org/10.1109/ISPSD.2018.8393667","url":null,"abstract":"Due to serious self-heating effect, traditional DC stress is hard to be used for evaluating the hot-carrier degradation of the LDMOS above 600V. In this work, the hot-carrier degradation for a 724V-breakdown LDMOS is studied by adopting gate duty-cycle-accelerated AC stress. It demonstrates that hot-electrons injection and donor-like interface states generation happen near the drain when the gate pulse is high. No obvious degradation and recovery can be observed when the gate pulse is zero. Moreover, the short pulse edges enhance the decrease of on-resistance (Ron) due to transient hot-holes injection into bird's beak. The device lifetime is also calculated according to the proposed models related to duty-cycle.","PeriodicalId":166809,"journal":{"name":"2018 IEEE 30th International Symposium on Power Semiconductor Devices and ICs (ISPSD)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123544151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Monolithic integration of GaN-based NMOS digital logic gate circuits with E-mode power GaN MOSHEMTs","authors":"Minghua Zhu, E. Matioli","doi":"10.1109/ISPSD.2018.8393646","DOIUrl":"https://doi.org/10.1109/ISPSD.2018.8393646","url":null,"abstract":"In this work, we demonstrate high-performance NMOS GaN-based logic gates including NOT, NAND, and NOR by integration of E/D-mode GaN MOSHEMTs on silicon substrates. The load-to-driver resistance ratio was optimized in these logic gates by using a multi-finger gate design of E-mode GaN MOSHEMT to increase the logic swing voltage and noise margins, and reduce the transition periods. State-of-the-art NMOS inverter was achieved with logic swing voltage of 4.93 V at a supply voltage of 5 V, low-input noise margin of 2.13 V and high-input noise margin of 2.2 V at room temperature. Excellent high temperature performance, at 300°C, was observed with a logic swing of 4.85 V, low-input noise margin of 1.85 V and high-output noise margin of 2.2V. In addition, GaN-based NAND and NOR NMOS logic gates are reported for the first time with very good performance. Finally, the logic gates were monolithically integrated with high-voltage E-mode power transistors, which reveals a significant step forward towards monolithic integration of GaN power transistors with gate drivers.","PeriodicalId":166809,"journal":{"name":"2018 IEEE 30th International Symposium on Power Semiconductor Devices and ICs (ISPSD)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129581560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Comprehensive investigation on mechanical strain induced performance boosts in LDMOS","authors":"Wangran Wu, Siyang Liu, Jing Zhu, Weifeng Sun","doi":"10.1109/ISPSD.2018.8393602","DOIUrl":"https://doi.org/10.1109/ISPSD.2018.8393602","url":null,"abstract":"In this paper, we have comprehensively investigated the performance of LDMOS under mechanical strain. The electrical properties of nLDMOS under uniaxial tensile (UT) strain along channel direction are examined thoroughly. We find that the nLDMOS with longer gate length (Lg) is more preferred for strain. Both lateral electric field (Vd) and vertical electric field (Vg) play an important role on the strain effects. The piezoresistance coefficients of nLDMOS are evaluated for the first time. Neglectable breakdown voltage (Vbd) degradation is observed with the 4.4% drain current (Id) increase under UT strain. Finally, the biaxial tensile strain and uniaxial compressive strain parallel to channel are proved to be most efficient for nLDMOS and pLDMOS with 8.8% and 14.5% Ron reduction, respectively.","PeriodicalId":166809,"journal":{"name":"2018 IEEE 30th International Symposium on Power Semiconductor Devices and ICs (ISPSD)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126240971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Robustness improvement of short-circuit capability by SiC trench-etched double-diffused MOS (TED MOS)","authors":"N. Tega, K. Tani, D. Hisamoto, A. Shima","doi":"10.1109/ISPSD.2018.8393697","DOIUrl":"https://doi.org/10.1109/ISPSD.2018.8393697","url":null,"abstract":"A 3.3-kV SiC trench-etched double-diffused MOS (TED MOS) is designed and fabricated for robust short-circuit (SC) capability. Because of its low-Vover (Vg — Vth) operation, the TED MOS successfully reduces the drain current in saturation region to less than 700 A/cm2 at SC tests. The low drain current in a saturation region enhances the SC capability of the TED MOS. As a result, the SC endurance time of the TED MOS is 2.8 times longer than that of the conventional SiC DMOS.","PeriodicalId":166809,"journal":{"name":"2018 IEEE 30th International Symposium on Power Semiconductor Devices and ICs (ISPSD)","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122658754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}