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Photoluminescence Study of B‐Trions in MoS 2 Monolayers with High Density of Defects
Author(s) -
Kaupmees Reelika,
Komsa HannuPekka,
Krustok Jüri
Publication year - 2019
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201800384
Subject(s) - trion , photoluminescence , exciton , spectroscopy , recombination , materials science , monolayer , excitation , spontaneous emission , atomic physics , molecular physics , physics , chemistry , optoelectronics , condensed matter physics , optics , nanotechnology , laser , biochemistry , quantum mechanics , gene
Photoluminescence spectroscopy has been used to investigate the details of B band emission from single‐layer MoS 2 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.