Journal
NANO LETTERS
Volume 14, Issue 7, Pages 4125-4130Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl5017283
Keywords
MoS2; photoluminescence; quantum efficiency; efficiency droop; Auger recombination; carrier lifetime
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Funding
- Natural Sciences and Engineering Research Council of Canada
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We have investigated the quantum efficiency of monolayer MoS2 light-emitting devices through detailed temperature and power-dependent photoluminescence studies and rate equation analysis. The internal quantum efficiency can reach 45 and 8.3% at 83 and 300 K, respectively. However, efficiency droop is clearly measured with increasing carrier injection due to the unusually large Auger recombination coefficient, which is found to be similar to 10(-24) cm(6)/s at room temperature, nearly 6 orders of magnitude higher than that of conventional bulk semiconductors. The significantly elevated Auger recombination in the emerging two-dimensional (2D) semiconductors is primarily an indirect process and is attributed to the abrupt bounding surfaces and the enhanced correlation, mediated by magnified Coulomb interactions, between electrons and holes confined in a 2D structure.
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