钙钛矿(结构)
光伏系统
材料科学
光电子学
卤化物
载流子寿命
扩散
半导体
介电谱
能量转换效率
光伏
钙钛矿太阳能电池
太阳能电池
纳米技术
硅
化学
无机化学
结晶学
物理化学
物理
电气工程
电极
工程类
热力学
电化学
作者
Victoria González-Pedro,Emilio J. Juárez-Pérez,Waode-Sukmawati Arsyad,Eva M. Barea,Francisco Fabregat‐Santiago,Iván Mora‐Seró,Juan Bisquert
出处
期刊:Nano Letters
[American Chemical Society]
日期:2014-01-10
卷期号:14 (2): 888-893
被引量:777
摘要
Organometal halide perovskite-based solar cells have recently realized large conversion efficiency over 15% showing great promise for a new large scale cost-competitive photovoltaic technology. Using impedance spectroscopy measurements we are able to separate the physical parameters of carrier transport and recombination in working devices of the two principal morphologies and compositions of perovskite solar cells, viz. compact thin films of CH3NH3PbI(3-x)Clx and CH3NH3PbI3 infiltrated on nanostructured TiO2. The results show nearly identical spectral characteristics indicating a unique photovoltaic operating mechanism that provides long diffusion lengths (1 μm). Carrier conductivity in both devices is closely matched, so that the most significant differences in performance are attributed to recombination rates. These results highlight the central role of the CH3NH3PbX3 semiconductor absorber in carrier collection and provide a new tool for improved optimization of perovskite solar cells. We report for the first time a measurement of the diffusion length in a nanostructured perovskite solar cell.
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