کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6535243 | 49304 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
PECVD-AlOx/SiNx passivation stacks on wet chemically oxidized silicon: Constant voltage stress investigations of charge dynamics and interface defect states
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The negative charge formation, the charge-trapping mechanisms and the interface defect passivation of aluminum oxide/silicon nitride (AlOx/SiNx) stacks deposited by plasma-enhanced chemical vapor deposition on p-type crystalline silicon (c-Si) are investigated. Constant voltage stress (CVS) investigations combined with capacitance-voltage (C-V) hysteresis analysis indicate the influence of different thermal treatments on the negative charge formation and allow discerning between fixed and trapped charges in the AlOx/SiNx system. The thermal budget during SiNx deposition activates negatively charged traps. An annealing step leads to the formation of a stable, fixed negative charge and reduces the defect state density (Dit) at the c-Si/AlOx interface. A wet-chemical silicon oxidation (SiOx) of the c-Si surface reduces Dit even further, but introduces additional traps at the wet-chemical SiOx/AlOx interface. These traps lead to instabilities of the negative charge density and have a detrimental effect on the passivation quality. However, a firing step leads to the formation of a higher negative charge density due to charged traps. Combined with the enhanced chemical passivation, this results in a higher passivation quality than upon annealing. The trap-related negative charge upon firing is unstable due to electron detrapping. However, a positive CVS can recharge traps in the wet-chemical SiOx/AlOx/SiNx system negatively through electron injection from the c-Si.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solar Energy Materials and Solar Cells - Volume 135, April 2015, Pages 49-56
Journal: Solar Energy Materials and Solar Cells - Volume 135, April 2015, Pages 49-56
نویسندگان
Jan Amaru Töfflinger, Abdelazize Laades, Lars Korte, Caspar Leendertz, Liz Margarita Montañez, Uta Stürzebecher, Hans-Peter Sperlich, Bernd Rech,