Vibronic Exciton-Phonon States in Stack-Engineered van der Waals Heterojunction Photodiodes.

ABSTRACT: 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 a

SUBMITTER: Barati F 

PROVIDER: S-EPMC9335870 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature