Xu Xiaobao, Zhang Hua, Cao Kun, Cui Jin, Lu Jianfeng, Zeng Xianwei, Shen Yan, Wang Mingkui
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074 (P.R. China).
ChemSusChem. 2014 Nov;7(11):3088-94. doi: 10.1002/cssc.201402566. Epub 2014 Sep 11.
This work reports on an investigation into interfacial charge transfer in CH3NH3PbI3 perovskite solar cells by using anatase TiO2 nanocuboids enclosed by active {100} and {001} facets. The devices show 6.0 and 8.0% power conversion efficiency with and without hole-transport material. Transient photovoltage/photocurrent decay and charge extraction, as well as impedance spectroscopy measurements, reveal that carbon materials are effective counter electrodes in perovskite solar cells. The photogenerated charges are observed to be stored in mesoporous TiO2 film under illumination and in the CH3NH3PbI3 layer in the dark. The use of 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9-spirobifluorene (spiro-MeOTAD) as a hole-transport material accelerates interfacial charge recombination between the photogenerated electrons and holes.
这项工作报道了通过使用由活性{100}和{001}面围成的锐钛矿型TiO₂纳米立方体来研究CH₃NH₃PbI₃钙钛矿太阳能电池中的界面电荷转移。有和没有空穴传输材料时，该器件的功率转换效率分别为6.0%和8.0%。瞬态光电压/光电流衰减和电荷提取以及阻抗谱测量表明，碳材料是钙钛矿太阳能电池中有效的对电极。观察到光生电荷在光照下存储在介孔TiO₂薄膜中，在黑暗中存储在CH₃NH₃PbI₃层中。使用2,2',7,7'-四（N,N-二对甲氧基苯胺）-9,9-螺二芴（spiro-MeOTAD）作为空穴传输材料会加速光生电子和空穴之间的界面电荷复合。
