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Temperature and density dependence of exciton dynamics in IIa diamond: Experimental and theoretical study
Author(s) -
Kozák Martin,
Trojánek František,
Malý Petr
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431174
Subject(s) - exciton , photoluminescence , diamond , condensed matter physics , diffusion , materials science , excited state , charge carrier density , molecular physics , chemistry , atomic physics , physics , thermodynamics , doping , optoelectronics , composite material
We studied dependence of time‐resolved and time‐integrated photoluminescence of free excitons in IIa type monocrystalline diamond on sample temperature and carrier density. Numerical model based on rate equations for time evolution of excited carrier and occupied traps populations was used for theoretical modelling. The density dependent diffusion and free carrier/free exciton equilibrium were shown to be important factors in exciton recombination dynamics. Room temperature quantum yield of excitonic photoluminescence was found to be strongly dependent on the carrier density with the highest measured value of 13% at n = 10 17 cm −3 .