Two-step photon up-conversion solar cell: propose and demonstration

被引:1
|
作者
Asahi, S. [1 ]
Kita, T. [1 ]
机构
[1] Kobe Univ, Dept Elect & Elect Engn, Grad Sch Engn, Nada Ku, 1-1 Rokkodai, Kobe, Hyogo 6578501, Japan
来源
PHYSICS, SIMULATION, AND PHOTONIC ENGINEERING OF PHOTOVOLTAIC DEVICES VII | 2018年 / 10527卷
关键词
Intermediate-band solar cell; Hetero-interface; GaAs; Al0.3Ga0.7As; EFFICIENCY;
D O I
10.1117/12.2292681
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We have proposed a two-step photon up-conversion solar cell (TPU-SC), which is a single junction solar cell comprising a wide gap semiconductor (WGS) and a narrow gap semiconductor (NGS) to break through the Shockley-Queisser limit for the single junction solar cells. In the TPU-SC, below-gap photons of WGS excite the NGS and accumulate electrons at the WGS/NGS hetero-interface. The accumulated electrons at the hetero-interface are easily excited towards the WGS barrier by the low-energy photons, resulting in the efficient two-step up-conversion (TPU). We have experimentally demonstrated highly efficient current generation by the TPU. In this paper, we present the concept of the TPU-SC, theoretical prediction of the conversion efficiency of the TPU-SC, and experimental result of efficient photocarrier collection attributable to the TPU phenomenon.
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页数:7
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