Early-stage local chemistry regulation enabling open-circuit voltage of 847 mV in wide-bandgap Cu2ZnSnS4 solar cells

Engineering notes

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Chinese explanation / 中文解读

中文解读待补充：本站会优先为光伏效率、钙钛矿太阳能电池、储能技术、太阳能热利用、BIPV、并网技术等高价值论文补充中文说明。

Original abstract

Abstract Wide-bandgap kesterite Cu 2 ZnSnS 4 (CZTS) is a promising top-cell candidate for tandem photovoltaics, yet its progress is limited by persistent open-circuit voltage ( V OC ) deficits. Previous reports of wide-bandgap CZTS solar cells have exhibited substantial V OC losses relative to the radiative limit, largely due to a mismatch between the designed global composition and the local chemistry formed during early crystallization, where elemental diffusion induces secondary phases and detrimental defects. Here we demonstrate a defect regulation strategy that stabilizes the local chemical environment and suppresses diffusion-induced secondary phases, therefore maintaining the desired crystallization environment and pathway. This approach promotes benign defects over detrimental ones, thereby reducing non-radiative recombination losses. Consequently, we achieve a certified champion V OC of 847 mV (65.3% of the radiative limit) and an efficiency of 12.4% in Cd-free wide-bandgap CZTS solar cells. This defect regulation strategy provides a generalized insight into the synthesis of multinary compound semiconductors.

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