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Room‐Temperature Exciton‐Based Optoelectronic Switch
Author(s) -
Ye Tong,
Zhou Boxuan,
Liu Zeyi,
Li Yongzhuo,
Shen Hongzhi,
Ning CunZheng,
Li Dehui
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202005918
Subject(s) - exciton , optoelectronics , materials science , optical switch , doping , photoelectric effect , monolayer , fabrication , voltage , electron , nanotechnology , electrical engineering , physics , condensed matter physics , alternative medicine , engineering , pathology , quantum mechanics , medicine
Excitons, bound pairs of electrons and holes, could act as an intermediary between electronic signal processing and optical transmission, thus speeding up the interconnection of photoelectric communication. However, up to date, exciton‐based logic devices such as switches that work at room temperature are still lacking. This work presents a prototype of a room‐temperature optoelectronic switch based on excitons in WSe 2 monolayer. The emission intensity of WSe 2 stacked on Au and SiO 2 substrates exhibits completely opposite behaviors upon applying gate voltages. Such observation can be ascribed to different doping behaviors of WSe 2 caused by charge‐transfer and chemical‐doping effect at WSe 2 /Au and WSe 2 /SiO 2 interfaces, respectively, together with the charge‐drift effect. These interesting features can be utilized for optoelectronic switching, confirmed by the cyclic PL switching test for a long time exceeding 4000 s. This study offers a universal and reliable approach for the fabrication of exciton‐based optoelectronic switches, which would be essential in integrated nanophotonics.