Epitaxial quasi-2D/3D hybrid perovskite heterojunctions for photodetector with enhanced detectivity and stability  

作　　者：Yifu Chen Lin Zhang Xinxin Peng Weiran Qin Shiqing Li Yingwei Wang Zhihui Chen Si Xiao Bin Yang Biao Liu Junliang Yang Han Huang Yun Lin Jun He Liming Ding Yongbo Yuan 

机构地区：[1]Hunan Key Laboratory of Super Microstructure and Ultrafast Process,School of Physics,Central South University,Changsha 410083,China [2]Hunan Key Laboratory of Nanophotonics and Devices,School of Physics,Central South University,Changsha 410083,China [3]College of Materials Science and Engineering,Hunan University,Changsha 410082,China [4]Department of Photoelectric Information,School of Physics,Central South University,Changsha 410083,China [5]Center for Excellence in Nanoscience,Key Laboratory of Nanosystem and Hierarchical Fabrication,National Center for Nanoscience and Technology,Chinese Academy of Science,Beijing 100190,China

出　　处：《Nano Research》2024年第7期6594-6602,共9页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.52273202,62104261,51673218,and 62004066);the National Key Research and Development Program of China(No.2022YFB3803300);the Natural Science Program of Xinjiang Uygur Autonomous Region(No.2023D01D03);the Major Scientific and Technological Project of Changsha(No.kq2301002);the Program of Hundreds of Talents of Hunan Province and Changsha Municipal Natural Science Foundation(No.KQ2007027);the National Key Research and Development Program of China(No.2023YFE0116800);the Beijing Natural Science Foundation(No.IS23037).

摘　　要：Although numerous metal halide perovskite materials have been investigated in the field of optoelectronic,the development of perovskite heterojunctions with exotic structures is still rare.Herein,we report the epitaxial growth of quasi-two-dimensional(Q-2D)perovskites on methylammonium lead iodide(MAPbI_(3))single crystals to form perovskite heterojunctions with interfacial bonding.The MAPbI_(3)adjacent to epitaxial Q-2D perovskite shows blue shifted photoluminescence with shortened lifetime,which becomes significant with the reduced layer number of the Q-2D perovskites.Our findings suggest the presence of an interfacial strain gradient leading to enhanced photocarrier separation.Accordingly,compared to the MAPbI_(3)single crystal detector,the BA_(2)MAPb_(2)I_(7)/MAPbI_(3)(BA:n-butylamine)heterojunction-based photodetector demonstrates a bandpass detecting property and exhibits 5 times enhanced external quantum efficiency and 83 times enhanced specific detectivity(D*=3.26×10^(11)Jones).Remarkably,the unencapsulated BA_(2)MAPb_(2)I_(7)/MAPbI_(3)heterojunction is stable in ambient condition for>300 days.The Q-2D/3D heterojunction shows suppressed ion inter-diffusion due to the presence of Q-2D phase.

关 键 词：epitaxial growth interfacial strain quasi-two-dimensional/three-dimensional(Q-2D/3D)heterojunctions ion inter-diffusion 

分 类 号：O61[理学—无机化学]