Interfacial-Water-Modulated Photoluminescence of Single-Layer WS2 on Mica
-
Published:2023-02-09
Issue:4
Volume:24
Page:3492
-
ISSN:1422-0067
-
Container-title:International Journal of Molecular Sciences
-
language:en
-
Short-container-title:IJMS
Author:
Kim Yanghee1,
Kang Haneul1,
Song Myeongin1,
Kwon Hyuksang2,
Ryu Sunmin1
Affiliation:
1. Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
2. Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea
Abstract
Because of their bandgap tunability and strong light–matter interactions, two-dimensional (2D) semiconductors are considered promising candidates for next-generation optoelectronic devices. However, their photophysical properties are greatly affected by their surrounding environment because of their 2D nature. In this work, we report that the photoluminescence (PL) of single-layer WS2 is substantially affected by interfacial water that is inevitably present between it and the supporting mica substrates. Using PL spectroscopy and wide-field imaging, we show that the emission signals from A excitons and their negative trions decreased at distinctively different rates with increasing excitation power, which could be attributed to the more efficient annihilation between excitons than between trions. By gas-controlled PL imaging, we also prove that the interfacial water converted the trions into excitons by depleting native negative charges through an oxygen reduction reaction, which rendered the excited WS2 more susceptible to nonradiative decay via exciton–exciton annihilation. Understanding the role of nanoscopic water in complex low-dimensional materials will eventually contribute to devising their novel functions and related devices.
Funder
National Research Foundation of Korea
Samsung Science and Technology Foundation
Samsung Electronics Co., Ltd.
Subject
Inorganic Chemistry,Organic Chemistry,Physical and Theoretical Chemistry,Computer Science Applications,Spectroscopy,Molecular Biology,General Medicine,Catalysis
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献