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Quantum dot and electron acceptor nano-heterojunction for photo-induced capacitive charge-transfer.


ABSTRACT: Capacitive charge transfer at the electrode/electrolyte interface is a biocompatible mechanism for the stimulation of neurons. Although quantum dots showed their potential for photostimulation device architectures, dominant photoelectrochemical charge transfer combined with heavy-metal content in such architectures hinders their safe use. In this study, we demonstrate heavy-metal-free quantum dot-based nano-heterojunction devices that generate capacitive photoresponse. For that, we formed a novel form of nano-heterojunctions using type-II InP/ZnO/ZnS core/shell/shell quantum dot as the donor and a fullerene derivative of PCBM as the electron acceptor. The reduced electron-hole wavefunction overlap of 0.52 due to type-II band alignment of the quantum dot and the passivation of the trap states indicated by the high photoluminescence quantum yield of 70% led to the domination of photoinduced capacitive charge transfer at an optimum donor-acceptor ratio. This study paves the way toward safe and efficient nanoengineered quantum dot-based next-generation photostimulation devices.

SUBMITTER: Karatum O 

PROVIDER: S-EPMC7843732 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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Quantum dot and electron acceptor nano-heterojunction for photo-induced capacitive charge-transfer.

Karatum Onuralp O   Eren Guncem Ozgun GO   Melikov Rustamzhon R   Onal Asim A   Ow-Yang Cleva W CW   Sahin Mehmet M   Nizamoglu Sedat S  

Scientific reports 20210128 1


Capacitive charge transfer at the electrode/electrolyte interface is a biocompatible mechanism for the stimulation of neurons. Although quantum dots showed their potential for photostimulation device architectures, dominant photoelectrochemical charge transfer combined with heavy-metal content in such architectures hinders their safe use. In this study, we demonstrate heavy-metal-free quantum dot-based nano-heterojunction devices that generate capacitive photoresponse. For that, we formed a nove  ...[more]

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