David B. Mitzi, Teodor K. Todorov, et al.
ACS National Meeting 2011
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. © 2014 The Royal Society of Chemistry.
David B. Mitzi, Teodor K. Todorov, et al.
ACS National Meeting 2011
Kong Fai Tai, Talia S. Gershon, et al.
Journal of Applied Physics
Oki Gunawan, Teodor K. Todorov, et al.
Applied Physics Letters
Bonna K. Newman, Elif Ertekin, et al.
Journal of Applied Physics