基于ZnO纳米棒阵列的钙钛矿太阳电池研究

Research on Perovskite Solar Cells Based on ZnO Nanorod Arrays

在钙钛矿太阳电池中利用水热法制备ZnO纳米棒阵列时,TiO_(2)薄膜一般是制备ZnO种子层以及后续生长ZnO纳米棒阵列的基础。因此TiO_(2)薄膜的致密和平滑程度对ZnO纳米棒阵列的生长及相应太阳电池的光伏性能有重要影响。本文通过使用水解-热解法以NbCl5为铌源在FTO导电基底上制备了Nb掺杂的TiO_(2)致密层,有效提升了TiO_(2)薄膜的致密程度,并在此基础上通过水热法成功沉积生长了具有不同长度、直径和面密度的ZnO纳米棒阵列。通过两步连续沉积法在所得ZnO纳米棒阵列上制备了摩尔比为CH3NH3I/CH3NH3Br=85/15的CH3NH3PbI3-xBrx钙钛矿薄膜。使用spiro–OMeTAD作为空穴传输层,组装了基于Nb掺杂TiO_(2)致密层的ZnO纳米棒阵列钙钛矿太阳电池,在相对湿度55%的空气中获得了13.97%的光电转换效率。

TiO_(2)thin film is the basis for the preparation of ZnO seed layer and the growth of ZnO nanorod arrays,when the ZnO nanorod arrays is prepared for perovskite solar cells via hydrothermal method.Therefore,the compactness and smoothness of TiO_(2)thin film have an important influence on the growth of ZnO nanorod arrays and the photovoltaic performance of the corresponding solar cells.In this paper,Nb doped TiO_(2)compact layers has been prepared onto FTO conductive substrates by hydrolysis-pyrolysis method using NbCl5 as niobium source,effectively improving the compactness of TiO_(2)thin films.ZnO nanorod arrays with different lengths,diameters and areal densities are successfully deposited by hydrothermal method.CH3NH3PbI3−xBrx perovskite films with a molar ratio of CH3NH3 I/CH3NH3Br=85/15 are prepared onto the ZnO nanorod arrays by two-step continuous deposition method.ZnO nanorod array perovskite solar cells based on Nb doped TiO_(2)compact layer are assembled using spiro-OMeTAD as hole transporting layer,and the photoelectric conversion efficiency is 13.97%in air with relative humidity of 55%.