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: 01 natural sciences; 7. Clean energy; Article; 0104 chemical sciences

AbstractDespite organometal halide perovskite solar cells have recently exhibited a significant leap in efficiency, the Sn-based perovskite solar cells still suffer from low efficiency. Here, a series homogeneous CH3NH3Pb(1−x)SnxI3 (0 ≤ x ≤ 1) perovskite thin films with full coverage were obtained via solvent engineering. In particular, the intermediate complexes of PbI2/(SnI2)∙(DMSO)x were proved to retard the crystallization of CH3NH3SnI3, thus allowing the realization of high quality Sn-introduced perovskite thin films. The external quantum efficiency (EQE) of as-prepared solar cells were demonstrated to extend a broad absorption minimum over 50% in the wavelength range from 350 to 950 nm accompanied by a noteworthy absorption onset up to 1050 nm. The CH3NH3Pb0.75Sn0.25I3 perovskite solar cells with inverted structure were consequently realized with maximum power conversion efficiency (PCE) of 14.12%.