2,2 '-Bis(1,3,4-thiadiazole)-Based pi-Conjugated Copolymers for Organic Photovoltaics with Exceeding 8% and Its Molecular Weight Dependence of Device Performance
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- Title
- 2,2 '-Bis(1,3,4-thiadiazole)-Based pi-Conjugated Copolymers for Organic Photovoltaics with Exceeding 8% and Its Molecular Weight Dependence of Device Performance
- Authors
- Fukuta, S.; Seo, J.; Lee, H.; Kim, H.; Kim, Y.; Ree, M.; Higashihara, T.
- Date Issued
- 2017-02
- Publisher
- American Chemical Society
- Abstract
- A series of novel ��-conjugated copolymers based on 2,2��-bis(1,3,4-thiadiazole) (BTDz) have been developed. Among them, the BTDz-based donor-acceptor alternating copolymer with the (E)-1,2-di(3-(2-ethylhexyl)thiophene)vinylene donor unit (PBTDzTV) exhibited a high solubility and high crystallinity. PBTDzTVs favorably self-assembled, forming face-on and edge-on multibilayer structures in thin nanoscale films. The relative volume fractions of these structures varied depending on the polymer��s molecular weight. The higher molecular weight polymer formed a higher volume fraction of the face-on structure; in particular, the polymer with a 26.6 kDa of number-average molecular weight made only the face-on structure. The device performance was improved as the polymer molecular weight and the volume fraction of the face-on structure increased. The bulk-heterojunction photovoltaic device based on PBTDzTV:PC71BM demonstrated the high power conversion efficiency (PCE) of 8.04% when the device was fabricated with the highest molecular weight polymer having the face-on structure. ? 2017 American Chemical Society.
- Keywords
- Heterojunctions; Polymers; Volume fraction; Alternating copolymer; Bulk heterojunction photovoltaic devices; Conjugated copolymers; Molecular weight polymers; Multibilayer structures; Number average molecular weight; Organic photovoltaics; Polymer molecular weight; Molecular weight
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/50728
- DOI
- 10.1021/acs.macromol.6b02475
- ISSN
- 0024-9297
- Article Type
- Article
- Citation
- Macromolecules, vol. 50, no. 3, page. 891 - 899, 2017-02
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