Perovskite heterojunction based on CH3NH3PbBr3 single crystal for high-sensitive self-powered photodetector
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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 450 nm 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.
Cao , M , Tian , J , Cai , Z , Peng , L , Yang , L & Wei , D 2016 , ' Perovskite heterojunction based on CH 3 NH 3 PbBr 3 single crystal for high-sensitive self-powered photodetector ' Applied Physics Letters , vol 109 , no. 23 , 233303 . DOI: 10.1063/1.4971772
Applied Physics Letters
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