Towards Lead-free Perovskite Solar Cells
作者单位：Institute of New Energy Technology College of Information Science and TechnologyJinan University
会议名称：《第四届新型太阳能电池学术研讨会》
会议日期：2017年
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
关 键 词：Lead free perovskite solar cells carrier dynamics stability
摘 要：Despite CHNHPbI perovskite solar cells have recently exhibited a significan improvement in efficiency, the Sn-based perovskite solar cells still suffer from low efficiency and poor stability that derived from the oxidation of Sn [1-4].Here, a series CHNHPb(1-x))SnI(0≤x≤1) perovskite thin films with full coverage were obtained via molecular self-assembly *** demonstrated that the electronic properties of CHNHPb(1-x))SnI(0≤x≤1) perovskite films, i.e., defect state density, carrier concentration, mobility and energy level, could be controllable by tuning the composition ratio of Pb/*** 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 *** CHNHPbSnI perovskite solar cells with inverted structure were consequently realized with maximum power conversion efficiency(PCE) over 14%, which displayed hysteresis-free effect and stabilized power output(SPO) over 12% within 200 s at 0.6 V forward ***, we further investigated the surface and bulk recombination lifetime of carriers, as well as the transient photovoltage decay curves of devices, which were favorable to clearly understand the carrier dynamics and optimize the Sn-Pb mixed perovskite solar ***, the modified hybrid Sn-Pb perovskite solar cells were demonstrated to own superior stability and efficiency when exposed to the ambien environment without *** present study is favorable to overcome the intractable issue concerning the toxic Pb element in perovskite solar cells and step forward toward realizing the lead-free perovskite solar cells with high efficiency.