Perovskite heterojunction based on CH3NH3PbBr3 single crystal for high-sensitive self-powered photodetector
Perovskite heterojunction based on CH3NH3PbBr3 single crystal for high-sensitive self-powered photodetector
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DOI：
10.1063/1.4971772
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发表时间：
2016-12-05
影响因子：
4
通讯作者：
Wei, Dacheng
中科院分区：
文献类型：
--
作者：
Cao, Min;Tian, Jiyu;Wei, Dacheng
由于钙钛矿单晶具有陷阱态密度低、载流子扩散距离长、吸收系数大等优点，具有优异的光电性能，因此基于钙钛矿单晶的光电探测器受到了广泛的研究兴趣。与报道的单组分单晶钙钛矿光电探测器不同，在这里，我们开发了一种简单的两步法来制造基于CH 3 NH3 PbBr 3单晶的核壳异质结。由所制备的钙钛矿异质结制成的光电探测器呈现归因于结中的内建电场的自功率特征，并且在零偏压下在450 nm照射下表现出峰值响应度高达11.5mA W-1的波长依赖性响应度，其比CH 3 NH3 PbBr 3单晶高一个数量级，并且显示出3.17%的最大外量子效率，也高于报道的0.2%的CH 3 NH3 PbBr 3单晶。我们的工作可能会导致更有效的自供电异质结系统的基础上钙钛矿单晶。出版社：AIP Publishing
Perovskite single crystals exhibit extraordinary optoelectronic performances due to their advantages such as low trap-state densities, long carrier diffusion, and large absorption coefficient, and thus, photodetectors based on perovskite single crystals have attracted much research interest. Unlike the reported one-component single-crystal perovskite photodetectors, here, we have developed a facile two-step approach to fabricate a core-shell heterojunction based on the CH3NH3PbBr3 single crystal. A photodetector made of the as-prepared perovskite heterojunction renders the feature of self-power attributed to a built-in electric field in the junction and exhibits a wavelength-dependent responsivity with a peak responsivity up to 11.5 mA W-1 under 450nm irradiation at zero bias, which is one order of magnitude higher than the CH3NH3PbBr3 single crystal and shows a maximum external quantum efficiency of 3.17%, also higher than the reported 0.2% of the CH3NH3PbBr3 single crystal. Our work may lead to more efficient self-powered heterojunction systems based on perovskite single crystals. Published by AIP Publishing.