4.6 Article

Onset of exciton-exciton annihilation in single-layer black phosphorus

期刊

PHYSICAL REVIEW B
卷 94, 期 7, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.075425

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资金

  1. French foreign ministry
  2. ANR JCJC project milliPICS
  3. Region Midi-Pyrenees [MESR 1305303]
  4. BLAPHENE project under IDEX program Emergence

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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, nonexponential 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.

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