Photoluminescence Study of B-Trions in MoS2 Monolayers with High Density of Defects

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Tallinn University of Technology

Abstract

Photoluminescence spectroscopy has been used to investigate the details of B band emission from single-layer MoS2 samples grown by chemical vapor deposition. The evolution of the peak shape upon variable excitation power is well described by a combination of exciton and trion contributions, from which B trion binding energy of 18 meV has been extracted. It has been suggested that the absence of accompanying A trion emission in our samples, as well as the enhanced intensity of the B band, can be ascribed to a fast non-radiative recombination channel arising from the large defect density in our samples. It has been found that band-selective recombination channels or formation of dark/bright trions are possible microscopic scenarios for our observations.

Details

Original languageEnglish
Article number1800384
Pages (from-to)1-5
JournalPhysica Status Solidi. B: Basic Research
Publication statusE-pub ahead of print - 1 Jan 2018
MoE publication typeA1 Journal article-refereed

    Research areas

  • chemical vapor deposition, monolayers, MoS, photoluminescence, trions

ID: 28771126