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Two-step photon up-conversion solar cell: propose and demonstration
Author(s): S. Asahi; T. Kita
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Paper Abstract

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.

Paper Details

Date Published: 16 February 2018
PDF: 7 pages
Proc. SPIE 10527, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices VII, 105270G (16 February 2018); doi: 10.1117/12.2292681
Show Author Affiliations
S. Asahi, Kobe Univ. (Japan)
T. Kita, Kobe Univ. (Japan)


Published in SPIE Proceedings Vol. 10527:
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices VII
Alexandre Freundlich; Laurent Lombez; Masakazu Sugiyama, Editor(s)

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