Time dependent study of multiple exciton generation in nanocrystal quantum dots

Research output: Contribution to journalArticle

Standard

Time dependent study of multiple exciton generation in nanocrystal quantum dots. / Damtie, Fikeraddis A.; Wacker, Andreas.

In: Journal of Physics, Conference Series, Vol. 696, No. 1, 012012, 12.04.2016.

Research output: Contribution to journalArticle

Harvard

APA

CBE

MLA

Vancouver

Author

RIS

TY - JOUR

T1 - Time dependent study of multiple exciton generation in nanocrystal quantum dots

AU - Damtie, Fikeraddis A.

AU - Wacker, Andreas

PY - 2016/4/12

Y1 - 2016/4/12

N2 - We study the exciton dynamics in an optically excited nanocrystal quantum dot. Multiple exciton formation is more efficient in nanocrystal quantum dots compared to bulk semiconductors due to enhanced Coulomb interactions and the absence of conservation of momentum. The formation of multiple excitons is dependent on different excitation parameters and the dissipation. We study this process within a Lindblad quantum rate equation using the full many-particle states. We optically excite the system by creating a single high energy exciton ESX in resonance to a double exciton EDX. With Coulomb electron-electron interaction, the population can be transferred from the single exciton to the double exciton state by impact ionisation (inverse Auger process). The ratio between the recombination processes and the absorbed photons provide the yield of the structure. We observe a quantum yield of comparable value to experiment assuming typical experimental conditions for a 4 nm PbS quantum dot.

AB - We study the exciton dynamics in an optically excited nanocrystal quantum dot. Multiple exciton formation is more efficient in nanocrystal quantum dots compared to bulk semiconductors due to enhanced Coulomb interactions and the absence of conservation of momentum. The formation of multiple excitons is dependent on different excitation parameters and the dissipation. We study this process within a Lindblad quantum rate equation using the full many-particle states. We optically excite the system by creating a single high energy exciton ESX in resonance to a double exciton EDX. With Coulomb electron-electron interaction, the population can be transferred from the single exciton to the double exciton state by impact ionisation (inverse Auger process). The ratio between the recombination processes and the absorbed photons provide the yield of the structure. We observe a quantum yield of comparable value to experiment assuming typical experimental conditions for a 4 nm PbS quantum dot.

U2 - 10.1088/1742-6596/696/1/012012

DO - 10.1088/1742-6596/696/1/012012

M3 - Article

VL - 696

JO - Journal of Physics, Conference Series

T2 - Journal of Physics, Conference Series

JF - Journal of Physics, Conference Series

SN - 1742-6596

IS - 1

M1 - 012012

ER -