Nonlinear photoluminescence in atomically thin layered WSe 2 arising from diffusion-assisted exciton-exciton annihilation

By S. Mouri, Y. Miyauchi, M. Toh, Weijie Zhao, G. Eda, K. Matsuda. 2014

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We studied multiexciton dynamics in monolayer WSe2 using nonlinear photoluminescence (PL) spectroscopy and Monte Carlo simulations. We observed strong nonlinear saturation behavior of exciton PL with increasing excitation power density and long-distance exciton diffusion, reaching several micrometers. We demonstrated that the diffusion-assisted exciton-exciton annihilation (EEA) model accounts for the observed nonlinear PL behavior. The long-distance exciton diffusion and subsequent efficient EEA process determined the unusual multiexciton dynamics in atomically thin layered transition metal dichalcogenides.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/07f16d15a2116f6f2a5d8d52c992eb3b38a880ea