Self-trapped excitons in two-dimensional perovskites  

作　　者：Junze LI Haizhen WANG Dehui LI 

机构地区：[1]School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China [2]Wuhan National Laboratory for Optoclectronics,Huazhong University of Science and Tcchnology,Wuhan 430074,China

出　　处：《Frontiers of Optoelectronics》2020年第3期225-234,共10页光电子前沿（英文版）

基　　金：D.L.acknowledges the support from the National Basic Research Program of China(No.2018YFA0704403);the National Natural Science Foundation of China(NSFC)(Grant No.61674060);Innovation Fund of Wuhan National Laboratory for Optoelectronics(WNLO).

摘　　要：With strong electron-phonon coupling,the self-trapped excitons are usually formed in materials,which leads to the local lattice distortion and localized excitons.The self-trapping strongly depends on the dimensionality of the materials.In the three dimensional case,there is a potential barrier for self-trapping,whereas no such barrier is present for quasi-one-dimensional systems.Two-dimensional(2D)systems are marginal cases with a much lower potential barrier or nonex istent potential barrier for the self-trapping,leading to the easier formation of self-trapped states.Self-trapped excitons emission exhibits a broadband emission with a large Stokes shift below the bandgap.2D perovskites are a class of layered structure material with unique optical properties and would find potential promising optoelectronic.In particular,self-trapped excitons are present in 2D per-ovskites and can significantly influence the optical and electrical properties of 2D perovskites due to the soft characteristic and strong electron-phonon interaction.Here,we summarized the luminescence characteristics,origins,and characterizations of self-trapped excitons in 2D perovskites and finally gave an introduction to their applications in optoelectronics.

关 键 词：self-trapped exciton(STE) two-dimensional(2D)perovskites broadband emission electron-phonon coupling optoelectronic applications 

分 类 号：O47[理学—半导体物理]