Excellent performance of photo detector based on CsPbBr3 films with ZnO nanoparticles decoration

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Zhigang Zang, Cunlong Li and Ceng Han

Chongqing University, China

: J Nanomater Mol Nanotechnol

Abstract

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Hybrid perovskites are considered to be promising candidates for the optoelectronic devices because they have the advantages of large absorption coefficients, ultrafast charge generation, and photon-generated carries with long lifetime and high mobility. These materials can be, however, thermally unstable, which is related to the organic constituents. The stability problem, fortunately, can be solved by replacing the organic cation CH3NH3 + with the inorganic cation Cs+, which results in all-inorganic perovskites (CsPbX3, X=Cl, Br, I) with significantly enhanced thermal stability. The particularly stable CsPbBr3 has been widely applied in solar cells, laser and LEDs. In addition, CsPbBr3 has also been investigated for its remarkable optoelectronic properties including the balanced electron and hole mobility-lifetime product, high electron mobility and small exciton binding energy. The remarkable properties of CsPbBr3 evoke our interest in developing novel photo detectors by using this material as the light absorber. In this paper, we demonstrate enhanced performance of solution-processed photo detectors composed of all-inorganic CsPbBr3 perovskite films with ZnO nanoparticles (NPs) decoration. Introducing ZnO NPs into CsPbBr3 precursor solution results in a film with more uniformly and compactly distributed crystalline grains. ZnO NPs can also promote the transport of photon-generated carriers from the central CsPbBr3 absorption layer to the lateral electrodes. Compared to the photo detectors without ZnO decoration, the fabricated all-inorganic CsPbBr3:ZnO photo detectors achieved comparable rise time of 0.409 s, fall time of 19.72 ms and on/off ratio of 12.86 without additional power source.

Biography

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Email: China.zangzg@cqu.edu.cn