articleScientific ReportsSep 13, 2013GOLD OA

Defects activated photoluminescence in two-dimensional semiconductors: interplay between bound, charged and free excitons

Institute of Semiconductors · University of California, Berkeley · +3 more institutions

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Abstract

Point defects in semiconductors can trap free charge carriers and localize excitons. The interaction between these defects and charge carriers becomes stronger at reduced dimensionalities, and is expected to greatly influence physical properties of the hosting material. We investigated effects of anion vacancies in monolayer transition metal dichalcogenides as two-dimensional (2D) semiconductors where the vacancies density is controlled by α-particle irradiation or thermal-annealing. We found a new, sub-bandgap emission peak as well as increase in overall photoluminescence intensity as a result of the vacancy generation. Interestingly, these effects are absent when measured in vacuum. We conclude that in…

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