In this work we compare non-contact charge-voltage imaging and UV-photoluminescence (UV-PL) imaging of yield killer defects in epitaxial 4H-SiC wafers. Two significant findings are based on macro- and micro-scale imaging, respectively. 1- Whole wafer images demonstrate that only a fraction of the UV-PL defects in triangular, downfall and carrot categories are electrically active. 2- Micro-scale images reveal similarities and differences between PL and electrical defect images. Presented for the first time, micrometer resolution leakage patterns within triangular defects are consistent with the microstructure modeling in reference 1. The results imply that the depletion layer leakage within killer defects corresponds to exposed 3C-SiC polytypes. This leakage may be a consequence of the lower 2.2eV energy gap of 3C-SiC compared to 3.3eV in 4H-SiC.
Bret Schrayer
Semilab SDI, Tampa, FL,
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Micro-scale Imaging of Electrical Activity of Yield Killer Defects in 4H-SiC with Charge Assisted KFM and UV-Photoluminescence
Jacek Lagowski, Semilab SDI, Tampa, FL,Marshall Wilson, Semilab SDI, Tampa, FL,David Greenock, X-FabDmitriy Marinskiy, Semilab SDI, Tampa, FL,Alexandre Savtchouk, Semilab SDIAnthony Ross III, Semilab SDICarlos Almeida, Semilab SDIBret Schrayer, Semilab SDI, Tampa, FL,John D’Amico, Semilab SDIDownload Paper -
May 19, 2022 // 1:50pm
17.2 Top Surface Edge Contact for Wafer Level Electrical Characterization of 2DEG in AlGaN/GaN on Semi-insulating Wafers
Dmitriy Marinskiy, Semilab SDI, Tampa, FL,Bret Schrayer, Semilab SDI, Tampa, FL,Mark Benjamin, Lehighton Electronics Inc,Jacek Lagowski, Semilab SDI, Tampa, FL,Marshall Wilson, Semilab SDI, Tampa, FL,D. Nguyen, Semilab LEI, Lehighton, PADownload PaperLoading...
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15.4.2023 Noncontact Measurement of Doping with Enhanced Throughput and High Precision for Wide Bandgap Wafer Manufacturing
M. Wilson, Semilab SDICarlos Almeida, Semilab SDII. Shekerov, Semilab SDIBret Schrayer, Semilab SDI, Tampa, FL,Alexandre Savtchouk, Semilab SDIB. Wilson, Semilab SDIJacek Lagowski, Semilab SDI, Tampa, FL,