https://scholars.lib.ntu.edu.tw/handle/123456789/577200
標題: | Design of thienothiophene-based copolymers with various side chain-end groups for efficient polymer solar cells | 作者: | Chao Y.-C Chen J.-H Chiou Y.-J Kao P.-L Wu J.-L Chen C.-T Chan L.-H Jeng R.-J. RU-JONG JENG |
關鍵字: | Charge transfer; Conjugated polymers; Heterojunctions; Microphase separation; Thiophene; Bulk heterojunction (BHJ); Conjugated copolymers; Intermolecular charge transfer interactions; Morphological properties; Photophysical properties; Polymer solar cell (PSCs); Power conversion efficiencies; Thienothiophenes; Polymer solar cells | 公開日期: | 2020 | 卷: | 12 | 期: | 12 | 起(迄)頁: | 1-16 | 來源出版物: | Polymers | 摘要: | Three two-dimensional donor–acceptor conjugated copolymers consisting of a benzo[1,2-b:4,5-b′ ]dithiophene derivative and thieno[3,2-b]thiophene with a conjugated side chain were designed and synthesized for use in bulk heterojunction (BHJ) or nonfullerene polymer solar cells (PSCs). Through attaching various acceptor end groups to the conjugated side chain on the thieno[3,2-b]thiophene moiety, the electronic, photophysical, and morphological properties of these copolymers were significantly affected. It was found that the intermolecular charge transfer interactions were enhanced with the increase in the acceptor strength on the thieno[3,2-b]thiophene moiety. Moreover, a better microphase separation was obtained in the copolymer: PC71BM or ITIC blend films when a strong acceptor end group on the thieno[3,2-b]thiophene moiety was used. As a result, BHJ PSCs based on copolymer:PC71BM blend films as active layers exhibited power conversion efficiencies from 2.82% to 4.41%, while those of nonfullerene copolymer:ITIC-based inverted PSCs ranged from 6.09% to 7.25%. These results indicate the side-chain engineering on the end groups of thieno[3,2-b]thiophene unit through a vinyl bridge linkage is an effective way to adjust the photophysical properties of polymers and morphology of blend films, and also have a significant influence on devices performance. ? 2020 by the authors. Licensee MDPI, Basel, Switzerland. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85097648993&doi=10.3390%2fpolym12122964&partnerID=40&md5=06c1635bd07c20ea638429a1aeba1c21 https://scholars.lib.ntu.edu.tw/handle/123456789/577200 |
ISSN: | 20734360 | DOI: | 10.3390/polym12122964 |
顯示於: | 高分子科學與工程學研究所 |
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