纳米晶材料
材料科学
金红石
锐钛矿
氧化锡
能量转换效率
化学工程
钙钛矿(结构)
太阳能电池
图层(电子)
光伏
基质(水族馆)
纳米技术
光电子学
兴奋剂
光伏系统
化学
光催化
海洋学
催化作用
生物化学
生态学
生物
工程类
地质学
作者
Aswani Yella,Leo-Philipp Heiniger,Peng Gao,Mohammad Khaja Nazeeruddin,Michaël Grätzel
出处
期刊:Nano Letters
[American Chemical Society]
日期:2014-04-02
卷期号:14 (5): 2591-2596
被引量:404
摘要
We demonstrate low-temperature (70 °C) solution processing of TiO2/CH3NH3PbI3 based solar cells, resulting in impressive power conversion efficiency (PCE) of 13.7%. Along with the high efficiency, a strikingly high open circuit potential (VOC) of 1110 mV was realized using this low-temperature chemical bath deposition approach. To the best of our knowledge, this is so far the highest VOC value for solution-processed TiO2/CH3NH3PbI3 solar cells. We deposited a nanocrystalline TiO2 (rutile) hole-blocking layer on a fluorine-doped tin oxide (FTO) conducting glass substrate via hydrolysis of TiCl4 at 70 °C, forming the electron selective contact with the photoactive CH3NH3PbI3 film. We find that the nanocrystalline rutile TiO2 achieves a much better performance than a planar TiO2 (anatase) film prepared by high-temperature spin coating of TiCl4, which produces a much lower PCE of 3.7%. We attribute this to the formation of an intimate junction of large interfacial area between the nanocrystalline rutile TiO2 and the CH3NH3PbI3 layer, which is much more effective in extracting photogenerated electrons than the planar anatase film. Since the complete fabrication of the solar cell is carried out below 100 °C, this method can be easily extended to plastic substrates.
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