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Issue 3, 2018
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Flexible crystalline silicon radial junction photovoltaics with vertically aligned tapered microwires

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Abstract

Much attention has been paid to thin crystalline silicon (c-Si) photovoltaic devices due to their excellent flexibility characteristics, stable efficiency, and possibility of use as highly efficient next-generation flexible photovoltaic devices (FPVs). To fabricate thin c-Si FPVs, it is important to improve their light-absorption properties while maintaining the flexible characteristics. In this study, vertically aligned microwires (MWs) on a 50 μm-thick thin c-Si substrate are designed for novel FPVs. Increasing the length of the MWs enhances the optical properties of the thin c-Si without affecting its flexibility. To maximize the efficiency of the thin c-Si FPVs with MWs, tapered MWs and a localized back-contact structure are devised. This device shows a maximum efficiency of 18.9%. In addition, the proposed thin c-Si FPV with MWs shows high stability without any change in efficiency, even with 1000 bending cycles with a bending radius of 12 mm. Thus, we successfully demonstrate battery-free flexible electronic devices integrated with our thin c-Si FPVs with MWs.

Graphical abstract: Flexible crystalline silicon radial junction photovoltaics with vertically aligned tapered microwires

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Supplementary files

Article information


Submitted
24 Nov 2017
Accepted
17 Jan 2018
First published
17 Jan 2018

Energy Environ. Sci., 2018,11, 641-647
Article type
Paper

Flexible crystalline silicon radial junction photovoltaics with vertically aligned tapered microwires

I. Hwang, H. Um, B. Kim, M. Wober and K. Seo, Energy Environ. Sci., 2018, 11, 641
DOI: 10.1039/C7EE03340K

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