Interfacial-Water-Modulated Photoluminescence of Single-Layer WS₂ on Mica.

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 tha

SUBMITTER: Kim Y 

PROVIDER: S-EPMC9963566 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature