کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1481720 991538 2012 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Improvement of a-Si1−xGex:H single-junction thin-film solar cell performance by bandgap profiling techniques
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Improvement of a-Si1−xGex:H single-junction thin-film solar cell performance by bandgap profiling techniques
چکیده انگلیسی

In this work, the effect of hydrogen dilution on the Ge content of the film and the effect of bandgap grading in the a-Si1−xGex:H absorber near the p/i and the i/n interfaces on cell performance were discussed. The a-Si1−xGex:H single-junction solar cells were improved by employing both p/i grading and i/n grading. The i/n grading increased the VOC and the FF while it also reduced the JSC as compared to the cell without grading. Presumably the potential gradient established by the i/n grading facilitates the hole transport hereby improved by the FF. On the contrary, the potential barrier established by the p/i grading seemed to limit the cell performance and constrain the p/i grading width below 20 nm due to the drop in FF and JSC. Combining the effects of bandgap grading on the VOC, JSC and FF, the suitable thicknesses of the p/i and the i/n grading were 20 nm and 45 nm, respectively. Finally, the grading structures accompanied with further optimization in doped layers were integrated to achieve a cell efficiency of 8.59%.


► We improve the a-SiGe:H single-junction solar cell performance by bandgap grading.
► Effect of bandgap grading width on the solar cell performance was demonstrated.
► Effect of hydrogen dilution on film Ge content was also showed.
► The increase in hydrogen dilution increased the film Ge content significantly.
► Appropriate bandgap grading width improved VOC and FF while slightly reducing JSC.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 358, Issue 17, 1 September 2012, Pages 2277–2280
نویسندگان
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