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Improvement of Photoresponse in Organic Phototransistors through Bulk Effect of Photoresponsive Gate Insulators

In this study, we investigate the bulk effect of photoresponsive gate insulators on the photoresponse of organic phototransistors (OPTs), using OPTs with poly(4-vinylphenol) layers of two different thicknesses. For the photoresponse, the interplay between the charge accumulation (capacitance) and li...

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Autores principales: Park, Hea-Lim, Kim, Min-Hoi, Kim, Hyeok
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7178102/
https://www.ncbi.nlm.nih.gov/pubmed/32231099
http://dx.doi.org/10.3390/ma13071565
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author Park, Hea-Lim
Kim, Min-Hoi
Kim, Hyeok
author_facet Park, Hea-Lim
Kim, Min-Hoi
Kim, Hyeok
author_sort Park, Hea-Lim
collection PubMed
description In this study, we investigate the bulk effect of photoresponsive gate insulators on the photoresponse of organic phototransistors (OPTs), using OPTs with poly(4-vinylphenol) layers of two different thicknesses. For the photoresponse, the interplay between the charge accumulation (capacitance) and light-absorbance capabilities of a photoresponsive gate insulator was investigated. Although an OPT with a thicker gate insulator exhibits a lower capacitance and hence a lower accumulation capability of photogenerating charges, a thicker poly(4-vinylphenol) layer, in contrast to a thinner one, absorbs more photons to generate more electron–hole pairs, resulting in a higher photoresponse of the device. That is, in these two cases, the degree of light absorption by the photoresponsive gate insulators dominantly governed the photoresponse of the device. Our physical description of the bulk effect of photoresponsive insulators on the performance of OPTs will provide a useful guideline for designing and constructing high-performance organic-based photosensing devices and systems.
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spelling pubmed-71781022020-04-28 Improvement of Photoresponse in Organic Phototransistors through Bulk Effect of Photoresponsive Gate Insulators Park, Hea-Lim Kim, Min-Hoi Kim, Hyeok Materials (Basel) Article In this study, we investigate the bulk effect of photoresponsive gate insulators on the photoresponse of organic phototransistors (OPTs), using OPTs with poly(4-vinylphenol) layers of two different thicknesses. For the photoresponse, the interplay between the charge accumulation (capacitance) and light-absorbance capabilities of a photoresponsive gate insulator was investigated. Although an OPT with a thicker gate insulator exhibits a lower capacitance and hence a lower accumulation capability of photogenerating charges, a thicker poly(4-vinylphenol) layer, in contrast to a thinner one, absorbs more photons to generate more electron–hole pairs, resulting in a higher photoresponse of the device. That is, in these two cases, the degree of light absorption by the photoresponsive gate insulators dominantly governed the photoresponse of the device. Our physical description of the bulk effect of photoresponsive insulators on the performance of OPTs will provide a useful guideline for designing and constructing high-performance organic-based photosensing devices and systems. MDPI 2020-03-28 /pmc/articles/PMC7178102/ /pubmed/32231099 http://dx.doi.org/10.3390/ma13071565 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Park, Hea-Lim
Kim, Min-Hoi
Kim, Hyeok
Improvement of Photoresponse in Organic Phototransistors through Bulk Effect of Photoresponsive Gate Insulators
title Improvement of Photoresponse in Organic Phototransistors through Bulk Effect of Photoresponsive Gate Insulators
title_full Improvement of Photoresponse in Organic Phototransistors through Bulk Effect of Photoresponsive Gate Insulators
title_fullStr Improvement of Photoresponse in Organic Phototransistors through Bulk Effect of Photoresponsive Gate Insulators
title_full_unstemmed Improvement of Photoresponse in Organic Phototransistors through Bulk Effect of Photoresponsive Gate Insulators
title_short Improvement of Photoresponse in Organic Phototransistors through Bulk Effect of Photoresponsive Gate Insulators
title_sort improvement of photoresponse in organic phototransistors through bulk effect of photoresponsive gate insulators
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7178102/
https://www.ncbi.nlm.nih.gov/pubmed/32231099
http://dx.doi.org/10.3390/ma13071565
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