2016/05/31 by A. Surrente, A. A. Mitioglu, K. Galkowski +5 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.94.075425
published as Phys. Rev. B 94, 075425 (2016) · 6 pages, 5 figures
arxiv created 2016/08/29 · arxiv updated 2016/08/30
The exciton dynamics in monolayer black phosphorus is investigated over a very wide range of photoexcited exciton densities using time resolved photoluminescence. At low excitation densities, the exciton dynamics is successfully described in terms of a double exponential decay. With increasing exciton population, a fast, non-exponential component develops as exciton-exciton annihilation takes over as the dominant recombination mechanism under high excitation conditions. Our results identify an upper limit for the injection density, after which exciton-exciton annihilation reduces the quantum yield, which will significantly impact the performance of light emitting devices based on single layer black phosphorus.