Effects of chemical composition, film thickness, and morphology on the electrochromic properties of donor-acceptor conjugated copolymers based on diketopyrrolopyrrole

A series of diketopyrrolopyrrole (DPP) and propylenedioxythiophene (ProDOT)-containing random copolymers with different donor-to-acceptor ratios is synthesized through Stille coupling polymerizations. The low-bandgap polymers display dark tones with colors ranging from magenta to blue, and reveal re...

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Main Authors: Neo, Wei Teng, Shi, Zugui, Cho, Ching Mui, Chua, Soo-Jin, Xu, Jianwei
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2015
Online Access:https://hdl.handle.net/10356/98574
http://hdl.handle.net/10220/38607
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-985742020-06-01T10:01:54Z Effects of chemical composition, film thickness, and morphology on the electrochromic properties of donor-acceptor conjugated copolymers based on diketopyrrolopyrrole Neo, Wei Teng Shi, Zugui Cho, Ching Mui Chua, Soo-Jin Xu, Jianwei School of Materials Science & Engineering A series of diketopyrrolopyrrole (DPP) and propylenedioxythiophene (ProDOT)-containing random copolymers with different donor-to-acceptor ratios is synthesized through Stille coupling polymerizations. The low-bandgap polymers display dark tones with colors ranging from magenta to blue, and reveal reversible colored-to-transmissive electrochromism in absorption/transmission-type devices with high optical contrasts (up to 48 and 77 % in the visible and near-infrared regions, respectively), modest switching speeds (a few to tens of seconds) and coloration efficiencies (267–574 cm2 C−1), as well as good long-term ambient redox stabilities. The structure–performance relationship of the polymers, in particular, the role of donor-to-acceptor ratio, is investigated, and it is shown that an increase in the amount of acceptor in the polymers leads to slower oxidative but faster reductive switching, accompanied with enhancement of the redox stability. In addition, further study on the influence of film thickness and film morphology reveals that devices with higher optical contrasts are attainable from thicker polymer films at the expense of switching speeds; films with high uniformity and connectedness together with open, loose structures at submicron to micron scale are favorable for achieving good electrochromic performance. ASTAR (Agency for Sci., Tech. and Research, S’pore) 2015-09-04T08:13:03Z 2019-12-06T19:57:01Z 2015-09-04T08:13:03Z 2019-12-06T19:57:01Z 2015 2015 Journal Article Neo, W. T., Shi, Z., Cho, C. M., Chua, S.-J., & Xu, J. (2015). Effects of chemical composition, film thickness, and morphology on the electrochromic properties of donor-acceptor conjugated copolymers based on diketopyrrolopyrrole. ChemPlusChem, 80(8), 1298-1305. 2192-6506 https://hdl.handle.net/10356/98574 http://hdl.handle.net/10220/38607 10.1002/cplu.201500182 en ChemPlusChem © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
institution Nanyang Technological University
building NTU Library
country Singapore
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language English
description A series of diketopyrrolopyrrole (DPP) and propylenedioxythiophene (ProDOT)-containing random copolymers with different donor-to-acceptor ratios is synthesized through Stille coupling polymerizations. The low-bandgap polymers display dark tones with colors ranging from magenta to blue, and reveal reversible colored-to-transmissive electrochromism in absorption/transmission-type devices with high optical contrasts (up to 48 and 77 % in the visible and near-infrared regions, respectively), modest switching speeds (a few to tens of seconds) and coloration efficiencies (267–574 cm2 C−1), as well as good long-term ambient redox stabilities. The structure–performance relationship of the polymers, in particular, the role of donor-to-acceptor ratio, is investigated, and it is shown that an increase in the amount of acceptor in the polymers leads to slower oxidative but faster reductive switching, accompanied with enhancement of the redox stability. In addition, further study on the influence of film thickness and film morphology reveals that devices with higher optical contrasts are attainable from thicker polymer films at the expense of switching speeds; films with high uniformity and connectedness together with open, loose structures at submicron to micron scale are favorable for achieving good electrochromic performance.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Neo, Wei Teng
Shi, Zugui
Cho, Ching Mui
Chua, Soo-Jin
Xu, Jianwei
format Article
author Neo, Wei Teng
Shi, Zugui
Cho, Ching Mui
Chua, Soo-Jin
Xu, Jianwei
spellingShingle Neo, Wei Teng
Shi, Zugui
Cho, Ching Mui
Chua, Soo-Jin
Xu, Jianwei
Effects of chemical composition, film thickness, and morphology on the electrochromic properties of donor-acceptor conjugated copolymers based on diketopyrrolopyrrole
author_sort Neo, Wei Teng
title Effects of chemical composition, film thickness, and morphology on the electrochromic properties of donor-acceptor conjugated copolymers based on diketopyrrolopyrrole
title_short Effects of chemical composition, film thickness, and morphology on the electrochromic properties of donor-acceptor conjugated copolymers based on diketopyrrolopyrrole
title_full Effects of chemical composition, film thickness, and morphology on the electrochromic properties of donor-acceptor conjugated copolymers based on diketopyrrolopyrrole
title_fullStr Effects of chemical composition, film thickness, and morphology on the electrochromic properties of donor-acceptor conjugated copolymers based on diketopyrrolopyrrole
title_full_unstemmed Effects of chemical composition, film thickness, and morphology on the electrochromic properties of donor-acceptor conjugated copolymers based on diketopyrrolopyrrole
title_sort effects of chemical composition, film thickness, and morphology on the electrochromic properties of donor-acceptor conjugated copolymers based on diketopyrrolopyrrole
publishDate 2015
url https://hdl.handle.net/10356/98574
http://hdl.handle.net/10220/38607
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