Improved performance of non-fullerene polymer solar cells by simple structural change of asymmetric acceptor based on indenothiophene
- Authors
- Jeong, Cheol Hun; Kim, Young Un; Park, Chang Geun; Choi, Suna; Cho, Min Ju; Choi, Dong Hoon
- Issue Date
- 12월-2018
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Indenothiophene; Methyl substituent; Asymmetric structure; Acceptor; Power conversion efficiency; Polymer solar cell
- Citation
- SYNTHETIC METALS, v.246, pp.164 - 171
- Indexed
- SCIE
SCOPUS
- Journal Title
- SYNTHETIC METALS
- Volume
- 246
- Start Page
- 164
- End Page
- 171
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/71319
- DOI
- 10.1016/j.synthmet.2018.10.014
- ISSN
- 0379-6779
- Abstract
- In this study, we have synthesized a new asymmetric n-type semiconducting molecule (Me-ITBD) by combining 4,4-bis(4-hexylphenyl)-7-methyl-6-(thiophen-2-yl)-4H-indeno thiophene with 2-(benzo [c] [1,2,5]-thiadiazol-4-yl methylene)-malononitrile and applied it to polymer solar cells. Compared to the PhITBD acceptor without methyl substituent in the 7-position of the core, Me-ITBD showed a larger torsional angle between thiophene and indenothiophene. Non-fullerene polymer solar cells (PSCs) with the methyl-substituted asymmetric acceptor Me-ITBD displayed an enhanced power conversion efficiency (PCE) of 5.75%, compared to the PSC (PCE = 1.79%) based on a PhITBD acceptor. The higher PCE value of the Me-ITBD-based PSC was ascribed to its improved device parameters, i.e. the J(sc) and FF, induced by a favorable fine morphology in the active layer. By simply introducing a methyl substituent in the indenothiophene unit of the PhITBD acceptor, the PSC performance was enhanced.
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