Journal
ADVANCED OPTICAL MATERIALS
Volume 9, Issue 13, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202100104
Keywords
charge dynamics; graphene; inorganic perovskites; photosensors; Stark effect
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Funding
- DSTL
- Engineering and Physical Sciences Research Council [EP/P031684/1]
- European Union
- China Postdoctoral Science Foundation [2020M680058]
- EPSRC [EP/P031684/1] Funding Source: UKRI
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This study reveals a slow and reversible quenching of NC photoluminescence, caused by a light-induced Stark effect involving defects on the NC surface and the redistribution of photoexcited carriers onto the NC surface. This phenomenon can impact the operation of optoelectronic devices based on these NCs.
Inorganic perovskite nanocrystals (NCs) have demonstrated a number of unique optical and electronic properties for optoelectronic applications. However, the physical properties of these nanostructures, such as the dynamics of charge carriers on different timescales and their effect on the optical recombination of carriers, are not yet fully understood. This work reports on a slow (>1 s) reversible quenching of the NC photoluminescence due to a light-induced Stark effect involving defects on the surface of the NCs and the redistribution of photoexcited carriers onto the NC surface. This phenomenon can influence the operation of optoelectronic devices based on these NCs, including hybrid photosensors based on graphene decorated with inorganic perovskite NCs, revealing their prospects and limitations.
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