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Controllable Synthesis and Photoexcited Dynamics of Organometal Halide Perovskite Quantum Dots

何胜  Shengye Jin  
【摘要】:Organometal halide perovskite quantum dot is one of the newly reported semiconductor materials with excellent photoelectric properties, such as high quantum yield, tunable band gap varying with size and consistent. With such characters, these quantum dots can make important contributions to the development of solar cells, photocatalysis and light-emitting device. However, the main barrier of its development is the weak stability. Thus, relevant photoelectric dynamics study are rare, which is, however, very meaningful and fundamental for these materials' application. In this article, we discussed various methods to prepare methylammonium lead halide(CH_3NH_3PbX_3, MAPbX_3,X=Cl, Br, I) perovskite quantum dots and improved the reported synthesis method. We also put forward a new method to make anion-blended MAPbX_3 quantum dots by anion exchanging. Using transient absorption spectroscopy, we studied the lifetime(4.84±0.07 ns) of MAPbBr_3 quantum dots at excited state with only one exciton in every dot. Also, we observed charge transfer from MAPbBr_3 quantum dots to benzoquinone(as the electron acceptor). At the same time, we prepared nanowires self-assembled by MAPbBr_3 nanoplatelets with the wire length at the level of micrometer, and studied them with time-resolved and photoluminescence-scanned confocal microscopy, but no carrier diffusion along the nanowire was observed. These synthesis and photoelectric dynamics research will offer fundamental support for the application of the organolead halide perovskite quantum dots.

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