Low band‐gap diketopyrrolopyrrole‐containing polymers for near infrared electrochromic and photovoltaic applications |
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| Authors: | Jonathan Zhaozhi Low Wei Teng Neo Qun Ye Wen Jie Ong Ivy Hoi Ka Wong Ting Ting Lin Jianwei Xu |
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| Affiliation: | 1. lnstitute of Materials Research and Engineering, A*STAR, Singapore, Singapore;2. NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, Singapore;3. Department of Chemistry, National University of Singapore, Singapore, Singapore |
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| Abstract: | Donor–acceptor type polymers bearing diketopyrrolopyrrole and 3,4‐ethylenedioxythiophene units are reported. The polymers are green and exhibit very low band‐gaps (1.19 eV) with strong and broad absorption (maxima of about 830 nm) in the near infrared (NIR) region in their neutral film states. The polymers display color changes between dark green and light blue with exceptional optical contrasts in the NIR regions of up to 78 and 63% as thin films and single‐layer electrochromic devices, respectively. Fast switching, good stabilities as well as high coloration efficiencies (743–901 cm2 C?1) were also observed. The polymers could also be potentially used as photovoltaic material, with a power conversion efficiency of up to 1.68%. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53, 1287–1295 |
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| Keywords: | conjugated polymers donor– acceptor diketopyrrolopyrrole electrochemistry electrochromic low band‐gap near infrared absorption synthesis |
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