Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 7, Issue 3, Pages 1029-1036Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ee42541j
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Funding
- Tokyo Ohka Kogyo Co., Ltd
- Solar Frontier K. K.
- IBM Corporation
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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.
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