Short-length and high-density TiO 2 nanorod arrays for the efficient charge separation interface in perovskite solar cells
Short-length and high-density TiO 2 nanorod arrays for the efficient charge separation interface in perovskite solar cells
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DOI：
10.1016/j.jssc.2017.03.005
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发表时间：
2017-05
影响因子：
3.3
通讯作者：
Guannan Xiao;Chengwu Shi;Zhengguo Zhang;Nannan Li;Long Li
中科院分区：
文献类型：
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作者：
Guannan Xiao;Chengwu Shi;Zhengguo Zhang;Nannan Li;Long Li
首先通过水热法使用38 mM异丙醇钛和6 M盐酸的水溶液在170 °C下生长60 min来制备长度为70 nm、直径为20 nm、面密度为1000 µm− 2的TiO 2纳米棒阵列。使用1.7 M PbI 2·DMSO络合物前体溶液和0.465 M甲基卤化铵混合物的异丙醇溶液（CH 3 NH3 I/CH 3 NH3 Br的摩尔比为85/15），通过顺序沉积路线成功地获得了厚度超过500 nm的CH 3 NH3 PbI 3 − xBrx吸收层。基于TiO 2纳米棒阵列和560 nm厚度的CH 3 NH3 PbI 3 − xBrx吸收层的钙钛矿太阳能电池表现出最佳的光电转换效率（PCE），为15.93%，而相应的没有TiO 2纳米棒阵列和530 nm厚度的CH 3 NH3 PbI 3 − xBrx吸收层的平面钙钛矿太阳能电池在50- 54%的相对湿度下表现出最佳的PCE，为12.82%。
The TiO2nanorod arrays with the length of 70 nm, the diameter of 20 nm, and the areal density of 1000 µm−2were firstly prepared by the hydrothermal method using the aqueous grown solution of 38 mM titanium isopropoxide and 6 M hydrochloric acid at 170 °C for 60 min. Over-500 nm-thickness CH3NH3PbI3−xBrxabsorber layers were successfully obtained by sequential deposition routes using 1.7 M PbI2·DMSO complex precursor solution and 0.465 M isopropanol solution of the methylammonium halide mixture with the molar ratio of CH3NH3I/CH3NH3Br=85/15. The perovskite solar cells based on the TiO2nanorod array and 560 nm-thickness CH3NH3PbI3−xBrxabsorber layer exhibited the best photoelectric conversion efficiency (PCE) of 15.93%, while the corresponding planar perovskite solar cells without the TiO2nanorod array and with 530 nm-thickness CH3NH3PbI3−xBrxabsorber layer gave the best PCE of 12.82% at the relative humidity of 50–54%.