Onset of exciton-exciton annihilation in single layer black phosphorus

• Main Authors: Surrente, A, Mitioglu, A. A, Galkowski, K, Klopotowski, L, Tabis, W, Vignolle, B, Maude, D. K, Plochocka, P
• Format: Journal Article
• Language: English
• Published: 29-08-2016
• Subjects: Physics - Mesoscale and Nanoscale Physics
• DOI: 10.48550/arxiv.1605.06998

Phys. Rev. B 94, 075425 (2016) 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.