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Issue 28, 2020, Issue in Progress
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Highly transparent phototransistor based on quantum-dots and ZnO bilayers for optical logic gate operation in visible-light

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Abstract

Highly transparent optical logic circuits operated with visible light signals are fabricated using phototransistors with a heterostructure comprised of an oxide semiconductor (ZnO) with a wide bandgap and quantum dots (CdSe/ZnS QDs) with a small bandgap. ZnO serves as a highly transparent active channel, while the QDs absorb visible light and generate photoexcited charge carriers. The induced charge carriers can then be injected into the ZnO conduction band from the QD conduction band, which enables current to flow to activate the phototransistor. The photoexcited charge transfer mechanism is investigated using time-resolved photoluminescence spectroscopy, scanning Kelvin probe microscopy, and ultraviolet photoelectron spectroscopy. Measurements show that carriers in the QD conduction band can transfer to the ZnO conduction band under visible light illumination due to a change in the Fermi energy level. Moreover, the barrier for electron injection into the ZnO conduction band from the QD conduction band is low enough to allow photocurrent generation in the QDs/ZnO phototransistor. Highly transparent NOT, NOR, and NAND optical logic circuits are fabricated using the QDs/ZnO heterostructure and transparent indium tin oxide electrodes. This work provides a means of developing highly transparent optical logic circuits that can operate under illumination with low-energy photons such as those found in visible light.

Graphical abstract: Highly transparent phototransistor based on quantum-dots and ZnO bilayers for optical logic gate operation in visible-light

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Supplementary files

Article information


Submitted
24 Feb 2020
Accepted
08 Apr 2020
First published
24 Apr 2020

This article is Open Access

RSC Adv., 2020,10, 16404-16414
Article type
Paper

Highly transparent phototransistor based on quantum-dots and ZnO bilayers for optical logic gate operation in visible-light

B. J. Kim, N. Cho, S. Park, S. Jeong, D. Jeon, Y. Kang, T. Kim, Y. S. Kim, I. K. Han and S. J. Kang, RSC Adv., 2020, 10, 16404
DOI: 10.1039/D0RA01756F

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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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