Dissociation of two-dimensional excitons in monolayer WSe2

Publication: Research - peer-reviewJournal article – Annual report year: 2018

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Two-dimensional (2D) semiconducting materials are promising building blocks for optoelectronic applications, many of which require efficient dissociation of excitons into free electrons and holes. However, the strongly bound excitons arising from the enhanced Coulomb interaction in these monolayers suppresses the creation of free carriers. Here, we identify the main exciton dissociation mechanism through time and spectrally resolved photocurrent measurements in a monolayer WSe2 p-n junction. We find that under static inplane electric field, excitons dissociate at a rate corresponding to the one predicted for tunnel ionization of 2D Wannier-Mott excitons. This study is essential for understanding the photoresponse of 2D semiconductors and offers design rules for the realization of efficient photodetectors, valley dependent optoelectronics, and novel quantum coherent phases.
Original languageEnglish
Article number1633
JournalNature Communications
Volume9
Issue number1
Number of pages7
ISSN2041-1723
DOIs
StatePublished - 2018
CitationsWeb of Science® Times Cited: 0
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