Cao Guoyang, Li Xiaofeng, Zhan Yaohui, Wu Shaolong, Shang Aixue, Zhang Cheng, Yang Zhenhai, Zhai Xiongfei
Opt Express. 2014 Dec 15;22 Suppl 7:A1761-7. doi: 10.1364/OE.22.0A1761.
The single nanowire solar cells (SNSCs) with radial junctions are expected to show the superiority in efficient carrier collection benefited from the largely shortened junction length. Considering that the conversion efficiency of the existing SNSCs is still limited due to the low operation voltage, we design μc-Si:H(core)/a-Si:H(shell) radial tandem SNSCs, giving much attention to the intrinsic optical and electrical properties. The core and shell cells are carefully engineered in order to realize the photocurrent matching. It is found that under matching condition the radius of the entire cell (R) shows linear dependence on the radius of the core cell (r), i.e., R ~1.2r. Under an optimal design of the tandem cell, the open-circuit voltage (photoconversion efficiency) is increased by 160% (34% relative) compared to the equivalent-size μc-Si:H SNSCs.
具有径向结的单纳米线太阳能电池（SNSCs）有望在高效载流子收集方面展现出优势，这得益于其大大缩短的结长度。鉴于现有SNSCs的转换效率因工作电压低而仍受到限制，我们设计了μc-Si:H（芯）/a-Si:H（壳）径向串联SNSCs，并高度关注其本征光学和电学性质。为实现光电流匹配，对芯电池和壳电池进行了精心设计。结果发现，在匹配条件下，整个电池的半径（R）与芯电池的半径（r）呈线性关系，即R ~1.2r。在串联电池的优化设计下，与等效尺寸的μc-Si:H SNSCs相比，开路电压（光转换效率）提高了160%（相对提高34%）。
