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Issue 3, 2014
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Optical designs that improve the efficiency of Cu2ZnSn(S,Se)4 solar cells

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Abstract

We present an optical-design approach that improves the short-circuit current and efficiency of Cu2ZnSn(S,Se)4 (CZTSSe) solar cells by tuning the thickness of the upper-device layers in order to maximize transmission into the CZTSSe absorber. The design approach combines optical modeling of idealized planar devices with a semi-empirical approach for treating the impact of surface roughness. Experimentally, we demonstrate that the new device architecture — which emphasizes thinner CdS and transparent-conducting layers — increases short-circuit current by about 10% in champion-caliber devices. These improvements are directly realized in the power-conversion efficiencies of CZTSSe devices, resulting in a certified improvement in the overall record power-conversion efficiency for CZTSSe from 11.1% to 12.0%. We also report comparable improvements for devices with band gaps in the range of 1.1–1.3 eV.

Graphical abstract: Optical designs that improve the efficiency of Cu2ZnSn(S,Se)4 solar cells

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Publication details

The article was received on 28 Jul 2014, accepted on 21 Oct 2013 and first published on 22 Oct 2013


Article type: Paper
DOI: 10.1039/C3EE42541J
Citation: Energy Environ. Sci., 2014,7, 1029-1036

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    Optical designs that improve the efficiency of Cu2ZnSn(S,Se)4 solar cells

    M. T. Winkler, W. Wang, O. Gunawan, H. J. Hovel, T. K. Todorov and D. B. Mitzi, Energy Environ. Sci., 2014, 7, 1029
    DOI: 10.1039/C3EE42541J

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