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

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ID: 264823
2021
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Abstract
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.
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karatum2021quantumscientific Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Karatum, Onuralp;Eren, Guncem Ozgun;Melikov, Rustamzhon;Onal, Asim;Ow-Yang, Cleva W.;Sahin, Mehmet;Nizamoglu, Sedat;
Journal Scientific reports
Year 2021
DOI
10.1038/s41598-021-82081-y
URL
https://doi.org/10.1038/s41598-021-82081-y
Keywords
Medicine Science

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