1. Study on limiting efficiencies of a-Si:H/μc-Si:H-based single-nanowire solar cells under single and tandem junction configurations
- Author
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Xiaofeng Li, Shaolong Wu, Xiongfei Zhai, Guoyang Cao, and Aixue Shang
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,Silicon ,Tandem ,Auger effect ,business.industry ,Photovoltaic system ,Nanowire ,chemistry.chemical_element ,Auger ,symbols.namesake ,chemistry ,Radiative transfer ,symbols ,Optoelectronics ,Atomic physics ,business ,Current density - Abstract
Detailed balance calculations are presented for a-Si:H/μc-Si:H-based single- and tandem-junction single-nanowire solar cells (S- and T-SNSCs). Our study is based on three-dimensional finite-element electromagnetic simulation and thermodynamic balanced analysis, which includes radiative and Auger recombinations simultaneously. We quantify and compare the limiting short-circuit current densities, open-circuit voltages, and light-conversion efficiencies of these highly compact photovoltaic cells, addressing especially the effect of Auger recombination on the open-circuit voltages of SNSCs. Results show that tandem design leads to much higher light-conversion capability than μc-Si:H S-SNSCs, but exhibits superior performance than a-Si:H S-SNSCs only for cells with large radii.
- Published
- 2015