Richard Haight, Talia S. Gershon, et al.
Semiconductor Science and Technology
Kesterite or Cu2ZnSn(Se,S)4 (CZTSSe) is an emerging earth-abundant thin-film solar cell technology with current world record of 12.6% which is still far behind its cousin, the CuInGaSe technology. We investigated Suns-Voc characteristics of our high performance kesterite solar cells using two setups: (1) Low intensity (1 sun) Suns-Voc system integrated to the standard solar simulator using motorized continuous density filter. (2) High intensity (∼300 suns) Suns-Voc. The CZTSSe high intensity Suns-Voc curves exhibit bending at high intensity, which reveal several Voc limiting mechanisms that could impact the Voc at 1 sun such as: low bulk conductivity (because of low hole density or low mobility), bulk or interface defects including tail states, and a non-ohmic back contact for low carrier density CZTSSe. The latter problem can be detected by high intensity Suns-Voc with different infra red bandpass filters. Some of these limiting factors contribute to an artificially lower Jsc-Voc diode ideality factor compared to that of standard light J-V. The Suns-Voc techniques developed here is also applicable to other thin film solar cell technologies.
Richard Haight, Talia S. Gershon, et al.
Semiconductor Science and Technology
Karen R. Maxcy, Roger D. Willett, et al.
Acta Crystallographica Section E: Structure Reports Online
Oki Gunawan, Yudistira Virgus
Journal of Applied Physics
David B. Mitzi
Journal of Materials Chemistry