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Self-assembled ultrafine CsPbBr_(3) perovskite nanowires for polarized light detection

Science China Materials 2021年第9期64卷 2261-2271页

作者： Zixing Peng Dandan Yang Bozhao Yin Xin Guo Shuang Li Qiuqiang Zhan Xiudi Xiao Xiaofeng Liu Zhiguo Xia Zhongmin Yang Jianrong Qiu Guoping Dong State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques and Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Centre for Optical and Electromagnetic Research South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Key Laboratory of Renewable Energy Guangdong Key Laboratory of New and Renewable Energy Research and DevelopmentGuangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China College of Optical Science and Engineering State Key Laboratory of Modern Optical InstrumentationZhejiang UniversityHangzhou 310027China

One-dimensional(1D)metal halide perovskite nanowire(NW)arrays with high absorption efficiency,emission yield and dielectric constants,as well as anisotropic optoelectronic properties have found applications in energy harvesting,flexible electronics,and biomedical imaging ***,a modified two-step solvothermal method is developed for the synthesis of self-assembled cubic CsPbBr_(3) NW *** method provides facile access to continuous and uniform ultrafine perovskite NWs and well-aligned pure perovskite NW arrayed *** excitation at 365 nm,the CsPbBr_(3) NWs give a strong blue emission observable to the naked *** CsPbBr_(3) NWs also exhibit strong two-photon excited luminescence under the irradiation with an 800 nm pulse *** rotating the polarization angle of the 800 nm laser,strong polarization dependence with a polarization degree up to~0.49 is demonstrated in the selfassembled CsPbBr_(3) NW array,although the CsPbBr_(3) NWs have an isotropic cubic *** on density functional theory(DFT)calculations,this polarization-dependent emission is correlated with the anisotropic charge density distribution of the perovskite *** findings suggest that the ultrafine CsPbBr_(3) NWs with a well-defined self-assembled architecture could be applied as next-generation polarizationsensitive photoelectronic detection materials.

关键词： ultrafine perovskite nanowires self-assembly perovskite nanowire array anisotropy polarization-sensitive detection

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