Perovskite heterojunction based on CH3NH3PbBr3 single crystal for high-sensitive self-powered photodetector

Perovskitesingle 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 onperovskitesingle crystals have attracted much research interest. Unlike the reported one-componentsingle-crystalperovskitephotodetectors, here, we have developed a facile two-step approach to fabricate a core-shellheterojunction based on the CH3NH3PbBr3single crystal. Aphotodetector made of the as-preparedperovskiteheterojunction 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 CH3NH3PbBr3single crystal and shows a maximum external quantum efficiency of 3.17%, also higher than the reported 0.2% of the CH3NH3PbBr3single crystal. Our work may lead to more efficient self-poweredheterojunction systems based onperovskitesingle crystals.

Source: Applied Physics Letters - December 6, 2016 Category: Physics Authors: Min Cao, Jiyu Tian, Zhi Cai, Lan Peng, Lei Yang and Dacheng Wei Source Type: research