Broadband light absorption and photoresponse enhancement in monolayer WSe_(2) crystal coupled to Sb_(2)O_(3) microresonators  

作　　者：Kun Ye Lixuan Liu Congpu Mu Kun Zhai Shiliang Guo Bochong Wang Anmin Nie Shuhan Meng Fusheng Wen Jianyong Xiang Tianyu Xue Ming Kang Yongji Gong Yongjun Tian Zhongyuan Liu 

机构地区：[1]Center for High Pressure Science(CHiPS),State Key Laboratory of Metastable Materials Science&Technology,Yanshan University,Qinhuangdao 066004,China [2]Hebei Key Laboratory of Microstructure Materials Physics,School of Science,Yanshan University,Qinhuangdao 066004,China [3]School of Materials Science and Engineering,Beihang University,Beijing 100191,China [4]School of Electrical Engineering,Yanshan University,Qinhuangdao 066004,China [5]College of Physics and Materials Science,Tianjin Normal University,Tianjin 300387,China

出　　处：《Nano Research》2022年第5期4653-4660,共8页纳米研究（英文版）

基　　金：This work is supported by the National Natural Science Foundation of China(Nos.51732010,51972280;51801175),and Natural Science Foundation of Hebei Province(No.E2019203233).

摘　　要：Monolayer(1L)transition metal dichalcogenides(TMDCs)have been attracting tremendous interest in recent years as promising candidate materials in atomic-scale optoelectronic devices due to their direct band gaps(1.5-2.2 eV)and strong light-matter interactions.Unfortunately,their practical applications are limited by low visible light absorption stemming from atomic thickness and negligible infrared response.Here,we report the triangular Sb_(2)O_(3) microresonators in wide thickness and lateral size distributions grown on 1L TMDCs and their created significant broadband enhancement of light adsorption and photoresponse in 1L WSe_(2) crystal via coexisting Fabry-Perot and whispering gallery type resonances.As an example of demonstration,1L WSe_(2) crystal coupled to Sb_(2)O_(3) microresonators with widely distributed sizes exhibits the enhanced visible light absorption by up to 5 folds and the simultaneously extended near infrared(NIR)one of more than 50%.For application of 1L WSe_(2) in photodetection,incorporation of Sb2O3 microresonators leads to significantly enhanced visible light responsivity by~10^(4) order and expanded NIR one of more than 400 mA·W^(-1).Similar results have been observed in the other 1L W(Mo)dichalcogenides coupled to Sb2O3 microresonators.This work provides a new route for development of the high-performance monolayer TMDCs-based optoelectronic devices.

关 键 词：transition metal dichalcogenides Sb_(2)O_(3)optical microresonator photodetectors enhanced absorption broad bandwidth 

分 类 号：TN215[电子电信—物理电子学]