A controllable fabrication of grain boundary PbI2 nanoplates passivated lead halide perovskites for high performance solar cells
A controllable fabrication of grain boundary PbI2 nanoplates passivated lead halide perovskites for high performance solar cells
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用于高性能太阳能电池的晶界 PbI2 纳米板钝化卤化铅钙钛矿的可控制造
DOI：
10.1016/j.nanoen.2016.05.003
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发表时间：
2016-08
期刊：
影响因子：
17.6
通讯作者：
Zhao Yixin
中科院分区：
文献类型：
--
作者：
Zhang Taiyang;Guo Nanjie;Li Ge;Qian Xufang;Zhao Yixin
我们展示了一种可控形成的晶界pbi2纳米板钝化ch3nh3pbi3和CH3NH3PbI2Br钙钛矿的高性能太阳能电池，效率高达17.8%和14.4%，高于相应的相纯钙钛矿太阳能电池。以缺乏氢卤化物的PbI2·xHI/Br前驱体与ch3nh2气体直接气固反应，制备了PbI2钝化平面钙钛矿膜。通过调整前驱体中氢卤化物的缺失量，可以控制pbi2杂质的数量。晶体生长研究表明，PbI2极有可能在退火结晶过程中形成，而不是以PbI2·xHI/Br前驱体膜或生长的钙钛矿膜的形式存在。在晶界处添加量可控的pbi2可以有效地钝化钙钛矿，延长了钙钛矿的发光寿命，提高了voc。
We demonstrate a controllable formation of grain boundary PbI2nanoplates passivated CH3NH3PbI3and CH3NH3PbI2Br perovskites for high performance solar cells with up to 17.8% and 14.4% efficiencies, which are higher than the corresponding phase pure perovskite solar cells. The PbI2passivated planar perovskite films were facilely prepared via direct gas/solid reaction of hydrohalide deficient PbI2·xHI/Br precursor with CH3NH2gas. The amount of PbI2impurities can be controlled by adjusting the hydrohalide deficiency in the precursors. The crystal growth investigation suggested that the PbI2is highly like to form during the annealing crystallization process instead of existing in either the PbI2·xHI/Br precursor films or as grown perovskite films. The PbI2with controllable amount locating at grain boundary could effectively passivate the perovskites with a longer PL lifetime and enhancedVoc.
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