Kesterite Cu2ZnSnS4 as a Low-Cost Inorganic Hole-Transporting Material for High-Efficiency Perovskite Solar Cells

• DOI: 10.1021/acsami.5b09572
• Publication Date: 2015-12-08T17:25:36Z
• Authors: Qiliang Wu; Cong Xue; Yi Li; Pengcheng Zhou; Weifeng Liu; Jun Zhu; Songyuan Dai; Changfei Zhu; Shangfeng Yang
• Keywords: Kesterite; Auxiliary electrode

Kesterite-structured quaternary semiconductor Cu2ZnSnS4 (CZTS) has been commonly used as light absorber in thin film solar cells on the basis of its optimal bandgap 1.5 eV, high absorption coefficient, and earth-abundant elemental constituents. Herein we applied CZTS nanoparticles a novel inorganic hole transporting material (HTM) for organo-lead halide perovskite (PSCs) first time, achieving power conversion efficiency (PCE) 12.75%, which is highest PCE PSCs with Cu-based HTMs reported up to now, quite comparable that obtained based organic HTM such 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-MeOTAD). The size incorporation condition were optimized, effects optical absorption, crystallinity, morphology interface between layer Au electrode investigated compared case spiro-MeOTAD HTM, revealing role efficient from top confirmed by prohibited charge recombination at perovskite/Au interface. On effectiveness low-cost competitive PSCs, demonstrate new photovoltaics conductor beyond traditional absorber.