Electrical control of excitonic oscillator strength and spatial distribution in a monolayer semiconductor  

作　　者：Yanming Wang Junrong Zhang Tianhua Ren Meng Xia Long Fang Xiangyi Wang Xingwang Zhang Kai Zhang Junyong Wang 

机构地区：[1]School of Nano-Tech and Nano-Bionics,University of Science and Technology of China,Hefei 230026,China [2]CAS Key Laboratory of Nanophotonic Materials and Devices&Key Laboratory of Nanodevices and Applications,i-Lab,Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO),Chinese Academy of Sciences,Suzhou 215123,China [3]Institute of Applied Physics and Materials Engineering,University of Macao,Taipa,Macao 999078,China [4]College of New Energy,Inner Mongolia University of Technology,Hohhot 010051,China

出　　处：《Nano Research》2024年第9期8424-8430,共7页纳米研究（英文版）

基　　金：supported by the National Key R&D Program of China(No.2021YFA1200804);the National Natural Science Foundation of China(Nos.62274175,61927813,and 12174422);Jiangsu Province Key R&D Program(Nos.BE2023009-5,BE2021007-3,and BK20232044);Suzhou Basic Research Program(Nos.SJC2023004,SJC2021005,and ZXL2022380);the support from the Central Guiding Local Science and Technology Development Fund of Inner Mongolia Autonomous Region(No.2022ZY0187);the Basic Study Fund of Universities of Inner Mongolia Autonomous Region(No.JY20220211).

摘　　要：Electrical modulation of luminescence is significant to modern light-emitting devices.Monolayer transition metal dichalcogenides are emerging direct-bandgap luminescent materials with unique excitonic properties,and the multiple exciton complexes provide new opportunities to modulate the property of luminescence in atomically thin semiconductors.Here,we report an electrical control of exciton emission in the oscillator strength and spatial distribution of excitons in a monolayer WS2.Effective modulation of excitonic emission intensity with a degree of modulation of~92%has been demonstrated by an electric field at room temperature.The spatial carrier redistribution tuned by a lateral electric field results in distinct excitonic emission patterns by design.The modulation approach to exciton oscillator strength and distribution provides an efficient way to investigate the exciton diffusion dynamics and to construct electrically tunable optoelectronic devices.

关 键 词：monolayer semiconductor EXCITON electrical modulation spatial distribution 

分 类 号：O47[理学—半导体物理]