https://scholars.lib.ntu.edu.tw/handle/123456789/627005
Title: | Structural influences of proquinoidal acceptor moieties on transistor performance and doping capability for diketopyrrolopyrrole-based dual-acceptor conjugated polymers | Authors: | Wu, YS Li, JS Chang, CY He, WE Michinobu, T Lin, YC WEN-CHANG CHEN CHU-CHEN CHUEH |
Keywords: | MOBILITY; ELECTRONICS; DEVICES | Issue Date: | 2022 | Publisher: | ROYAL SOC CHEMISTRY | Journal Volume: | 10 | Journal Issue: | 47 | Start page/Pages: | 17936 | Source: | JOURNAL OF MATERIALS CHEMISTRY C | Abstract: | In this study, we design and synthesize three DPP-based dual-acceptor conjugated polymers comprising different proquinoidal heterocyclic acceptors, including benzobisthiadizole (SS), triazolobenzothiadiazole (NS), and benzobistriazole (NN), and investigate their structure-property relationship using a transistor and their conductive states by doping. Owing to the high-spin and proquinoidal characteristics of the NN/NS/SS units, all the prepared polymers possess free radicals. However, a subtle difference in the proquinoidal characteristics among these acceptor units results in varied backbone rigidity and coplanarity of the derived polymers. DPP-NS and DPP-NN are shown to possess better solid-state stacking and crystallinity than DPP-SS, conferred by the alkyl side chains on the triazole unit. Hence, DPP-NS and DPP-NN can deliver enhanced mobilities of 3.0 × 10−2 and 5.3 × 10−2 cm2 V−1 s−1, respectively, after appropriate thermal annealing whereas the stiff DPP-SS only shows a minor improvement. Furthermore, the intrinsic intense radical characteristic of the NN unit is shown to facilitate the receivability of dopants. At a low doping concentration, DPP-NN delivers the highest conductivity of 23.8 S cm−1 among these polymers. Besides, owing to the higher degree of flexibility in chain packing and associated chain aggregation, DPP-NN displays a superior capability to resist the structural deconstruction in the doping state at a high concentration compared to DPP-NS and DPP-SS. Concisely, our results unravel the non-trivial influence of a proquinoidal acceptor moiety on transistor performance and doping capability of the derived polymers. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/627005 | ISSN: | 2050-7526 | DOI: | 10.1039/d2tc03956g |
Appears in Collections: | 化學工程學系 |
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