Perovskite CH3NH3PbI3-xBrx Single Crystals with Charge-Carrier Lifetimes Exceeding 260 μs.
Perovskite CH3NH3PbI3-xBrx Single Crystals with Charge-Carrier Lifetimes Exceeding 260 μs.
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载流子寿命超过260 μs的Percent CH_3 NH_3 PbI_3-xBrx单晶
DOI：
10.1021/acsami.7b01696
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发表时间：
2017-04
影响因子：
9.5
通讯作者：
Fengying Zhang;Bin Yang;Xin Mao;Ruixia Yang;Lei Jiang;Yajuan Li;J. Xiong;Yang Yang-Yang;Rongxing He;Weiqiao Deng;Ke-li Han
中科院分区：
文献类型：
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作者：
Fengying Zhang;Bin Yang;Xin Mao;Ruixia Yang;Lei Jiang;Yajuan Li;J. Xiong;Yang Yang-Yang;Rongxing He;Weiqiao Deng;Ke-li Han
钙钛矿单晶具有长的载流子寿命，对高性能光伏器件有着不可替代的贡献，近年来引起了人们的广泛关注。本文研究了CH 3 NH3 PbI 3和CH 3 NH3 PbI 3-xBrx（掺杂五种不同含量的溴）单晶的光学和光电性质。值得注意的是，在1个太阳光照下，在CH 3 NH3 PbI 3-xBrx（前体中I/Br = 10：1）单晶光伏器件中观察到高达262 μs的上级载流子寿命，这是CH 3 NH3 PbI 3单晶的两倍长。进一步的研究证实，超长的载流子寿命归因于器件界面的低陷阱态密度和高电荷注入效率的综合优势。在此基础上，适当地引入Br有助于设计更好的光伏器件。
The long carrier lifetimes in perovskite single crystals have drawn significant attention recently on account of their irreplaceable contribution to high-performance photovoltaic (PV) devices. Herein, the optical and optoelectronic properties of CH3NH3PbI3 and CH3NH3PbI3-xBrx (with five different contents of Br doped) single crystals were investigated. Notably, a superior carrier lifetime of up to 262 μs was observed in the CH3NH3PbI3-xBrx (I/Br = 10:1 in the precursor) single-crystal PV device under 1 sun illumination, which is two times longer than that in the CH3NH3PbI3 single crystal. Further study confirmed that the ultralong carrier lifetime was ascribed to the integrated superiority derived from both the low trap-state density and high charge-injection efficiency of the device interface. On this basis, appropriate incorporation of Br is useful in the design of better PV devices.