Highly Efficient Perovskite Solar Cells with Substantial Reduction of Lead Content

• DOI: 10.1038/srep35705
• Publication Date: 2016-10-18T09:58:14Z
• Authors: Chong Liu; Jiandong Fan; Hongliang Li; Cuiling Zhang; Yaohua Mai
• Keywords: Quantum Efficiency

Abstract Despite organometal halide perovskite solar cells have recently exhibited a significant leap in efficiency, the Sn-based still suffer from low efficiency. Here, series homogeneous CH 3 NH Pb (1−x) Sn x I (0 ≤ 1) thin films with full coverage were obtained via solvent engineering. In particular, intermediate complexes of PbI 2 /(SnI )∙(DMSO) proved to retard crystallization SnI , thus allowing realization high quality Sn-introduced films. The external quantum efficiency (EQE) as-prepared demonstrated extend broad absorption minimum over 50% wavelength range 350 950 nm accompanied by noteworthy onset up 1050 nm. 0.75 0.25 inverted structure consequently realized maximum power conversion (PCE) 14.12%.