Vibronic Exciton-Phonon States in Stack-Engineered van der Waals Heterojunction Photodiodes
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- acs.nanolett.2c00944
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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.
Originalsprog | Engelsk |
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Tidsskrift | Nano Letters |
Vol/bind | 22 |
Sider (fra-til) | 5751-5758 |
Antal sider | 8 |
ISSN | 1530-6984 |
DOI | |
Status | Udgivet - 5 jul. 2022 |
ID: 315390896