Journal article
Exciton ionization in multilayer transition-metal dichalcogenides
Photodetectors and solar cells based on materials with strongly bound excitons rely crucially on field-assisted exciton ionization. We study the ionization process in multilayer transition-metal dichalcogenides (TMDs) within the Mott-Wannier model incorporating fully the pronounced anisotropy of these materials.
Using complex scaling, we show that the field-dependence of the ionization process is strongly dependent on orientation. Also, we find that direct and indirect excitons behave qualitatively differently as a result of opposite effective anisotropy of these states. Based on first-principles material parameters, an analysis of several important TMDs reveals WSe2 and MoSe2 to be superior for applications relying on ionization of direct and indirect excitons, respectively.
Language: | English |
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Publisher: | IOP Publishing |
Year: | 2016 |
Pages: | 073043 |
ISSN: | 13672630 |
Types: | Journal article |
DOI: | 10.1088/1367-2630/18/7/073043 |
ORCIDs: | Latini, Simone and Thygesen, Kristian Sommer |