Polarization and time-resolved photoluminescence spectroscopy of excitons in MoSe2 monolayers
G. Wang, E. Palleau, T. Amand, S. Tongay, X. Marie, and B. Urbaszek
TL;DR
This study explores valley exciton dynamics in MoSe2 monolayers using polarization- and time-resolved photoluminescence spectroscopy at 4K, revealing low polarization degrees and fast exciton emission times.
Contribution
It provides the first detailed polarization and exciton lifetime measurements in MoSe2 monolayers, highlighting differences from other TMD monolayers.
Findings
Low circular polarization degree (~5%) in PL compared to MoS2 and WSe2.
Neutral exciton emission time of ≤3 ps.
Charged exciton (trion) emission time of 12 ps.
Abstract
We investigate valley exciton dynamics in MoSe2 monolayers in polarization- and time-resolved photoluminescence (PL) spectroscopy at 4K. Following circularly polarized laser excitation, we record a low circular polarization degree of the PL of typically . This is about 10 times lower than the polarization induced under comparable conditions in MoS2 and WSe2 monolayers. The evolution of the exciton polarization as a function of excitation laser energy and power is monitored in PL excitation (PLE) experiments. Fast PL emission times are recorded for both the neutral exciton of ps and for the charged exciton (trion) of 12 ps.
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