期刊
NANO LETTERS
卷 22, 期 14, 页码 5751-5758出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c00944
关键词
vibronic; photocurrent; interlayer excitons; stack engineering; van der Waals heterostructures
类别
资金
- Army Research Office Electronics Division
- Presidential Early Career Award for Scientists and Engineers (PECASE) through the Air Force Office of Scientific Research
- National Science Foundation Division of Materials Research CAREER Award
- United States Department of the Navy Historically Black Colleges, Universities and Minority Serving Institutions (HBCU/MI) [W911NF2110260]
- Fellowships and Internships in Extremely Large Data Sets (FIELDS) program [FA9550-20-1-0097]
- NASA MUREP Institutional Research Opportunity (MIRO) program [1651247]
- Royal Netherlands Academy of Arts and Sciences (KNAW) [N00014-19-1-2574]
- Canadian Institute of Solar Energy Research (CEA)
- Singapore Ministry of Education under its MOEAcRF Tier 3 Award [NNX15AP99A]
- European Research Council (ERC) under the European Union
- Villum Foundation
- NSF [MOE2018-T3-1-002]
- National Science Foundation [678862]
- [EFRI-1433395]
- [ACI-1053575]
- [TG-DMR130081]
Stack engineering is a metamaterial strategy that allows for the design of optical and electronic properties. In this study, the optoelectronic effects of stacking-induced strong coupling and interlayer excitons in heterojunction photodiodes were revealed.
Stack engineering, an atomic-scale metamaterial strategy, enables the design of optical and electronic properties in van der Waals heterostructure devices. Here we reveal the optoelectronic effects of stacking-induced strong coupling between atomic motion and interlayer excitons in WSe2/MoSe2 heterojunction photodiodes. To do so, we introduce the photocurrent spectroscopy of a stack-engineered photodiode as a sensitive technique for probing interlayer excitons, enabling access to vibronic states typically found only in molecule-like systems. The vibronic states in our stack are manifest as a palisade of pronounced periodic sidebands in the photocurrent spectrum in frequency windows close to the interlayer exciton resonances and can be shifted on demand through the application of a perpendicular electric field via a source-drain bias voltage. The observation of multiple well-resolved sidebands as well as their ability to be shifted by applied voltages vividly demonstrates the emergence of interlayer exciton vibronic structure in a stack-engineered optoelectronic device.
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