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 cont...

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Autores principales:	Onuralp Karatum, Guncem Ozgun Eren, Rustamzhon Melikov, Asim Onal, Cleva W. Ow-Yang, Mehmet Sahin, Sedat Nizamoglu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/59bcf1d36daf4b099dc165acf8ec7553
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spelling	oai:doaj.org-article:59bcf1d36daf4b099dc165acf8ec75532021-12-02T14:16:34ZQuantum dot and electron acceptor nano-heterojunction for photo-induced capacitive charge-transfer10.1038/s41598-021-82081-y2045-2322https://doaj.org/article/59bcf1d36daf4b099dc165acf8ec75532021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-82081-yhttps://doaj.org/toc/2045-2322Abstract 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.Onuralp KaratumGuncem Ozgun ErenRustamzhon MelikovAsim OnalCleva W. Ow-YangMehmet SahinSedat NizamogluNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Onuralp Karatum Guncem Ozgun Eren Rustamzhon Melikov Asim Onal Cleva W. Ow-Yang Mehmet Sahin Sedat Nizamoglu Quantum dot and electron acceptor nano-heterojunction for photo-induced capacitive charge-transfer
description	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.
format	article
author	Onuralp Karatum Guncem Ozgun Eren Rustamzhon Melikov Asim Onal Cleva W. Ow-Yang Mehmet Sahin Sedat Nizamoglu
author_facet	Onuralp Karatum Guncem Ozgun Eren Rustamzhon Melikov Asim Onal Cleva W. Ow-Yang Mehmet Sahin Sedat Nizamoglu
author_sort	Onuralp Karatum
title	Quantum dot and electron acceptor nano-heterojunction for photo-induced capacitive charge-transfer
title_short	Quantum dot and electron acceptor nano-heterojunction for photo-induced capacitive charge-transfer
title_full	Quantum dot and electron acceptor nano-heterojunction for photo-induced capacitive charge-transfer
title_fullStr	Quantum dot and electron acceptor nano-heterojunction for photo-induced capacitive charge-transfer
title_full_unstemmed	Quantum dot and electron acceptor nano-heterojunction for photo-induced capacitive charge-transfer
title_sort	quantum dot and electron acceptor nano-heterojunction for photo-induced capacitive charge-transfer
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/59bcf1d36daf4b099dc165acf8ec7553
work_keys_str_mv	AT onuralpkaratum quantumdotandelectronacceptornanoheterojunctionforphotoinducedcapacitivechargetransfer AT guncemozguneren quantumdotandelectronacceptornanoheterojunctionforphotoinducedcapacitivechargetransfer AT rustamzhonmelikov quantumdotandelectronacceptornanoheterojunctionforphotoinducedcapacitivechargetransfer AT asimonal quantumdotandelectronacceptornanoheterojunctionforphotoinducedcapacitivechargetransfer AT clevawowyang quantumdotandelectronacceptornanoheterojunctionforphotoinducedcapacitivechargetransfer AT mehmetsahin quantumdotandelectronacceptornanoheterojunctionforphotoinducedcapacitivechargetransfer AT sedatnizamoglu quantumdotandelectronacceptornanoheterojunctionforphotoinducedcapacitivechargetransfer
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Quantum dot and electron acceptor nano-heterojunction for photo-induced capacitive charge-transfer

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