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Proceedings Paper

Efficient broadband light absorption enhancement in InP/ZnO core-shell nanocone arrays for photovoltaic application
Author(s): Zongyi Zhang; Yonggang Wu; Xuefei Qin; Zihuan Xia; Jian Zhou
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Paper Abstract

Nanowire solar cells are of great interests due to their promising prospects as nano-electronic power sources. Here, we propose a standing semiconductor-dielectric core-shell nanocone array (CSNCA). We find that the CSNCA structure can not only concentrate the incident light into the structure, but also confine most of the concentrated light to the semiconductor (InP) core region, which enhances remarkably the light absorption of the more material-saving semiconductor core. Thanks to the gradient of diameter size along the axial in cone, incident light of different wavelengths can be maximally coupled into the core. We find guided resonance features along the radial and FP-resonant features along the axial by analyzing the electric field patterns at the absorption spectrum peaks. The CSNCA can support multiple higherorder HE modes, in comparison to the bare nanocone array (BNCA). Interaction of the adjacent higher-order HE modes results in broadband light absorption enhancement in the solar radiation spectrum. Carrier generation rates (G) have also been studied when the electrical part is discussed. CSNCAs show a unique advantage in G distribution. Results based on detailed balance analysis demonstrate that the core-shell design gives rise to higher short-circuit current and open-circuit voltage, and thus higher power conversion efficiency. This advantage is more apparent in thin structures compared with the thick ones. Detailed research is focused on the 1 μm high CSNCAs, and a remarkable enhancement (42.2%) is gained compared with the BNCAs. Our study shows that the CSNCAs can be promising candidates for application in super miniature photodetectors, nanometer power sources and ultra-thin film solar cells.

Paper Details

Date Published: 8 July 2019
PDF: 13 pages
Proc. SPIE 11064, Tenth International Conference on Thin Film Physics and Applications (TFPA 2019), 110640A (8 July 2019); doi: 10.1117/12.2536570
Show Author Affiliations
Zongyi Zhang, Tongji Univ (China)
Yonggang Wu, Tongji Univ (China)
Xuefei Qin, Tongji Univ. (China)
Zihuan Xia, Tongji Univ. (China)
Jian Zhou, Tongji Univ. (China)

Published in SPIE Proceedings Vol. 11064:
Tenth International Conference on Thin Film Physics and Applications (TFPA 2019)
Junhao Chu; Jianda Shao, Editor(s)

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