Elucidating the Chain-Extension Effect on the Exciton-Dissociation Mechanism through an Intra- or Interchain Polaron-Pair State in Push–Pull Conjugated Polymers
- Elucidating the Chain-Extension Effect on the Exciton-Dissociation Mechanism through an Intra- or Interchain Polaron-Pair State in Push–Pull Conjugated Polymers
- Lee, Dongki; 한세교; Kim, Hyojung; Hwang, Hyeongjin; Park, Chaneui; Noh, Jaebum; Mun, Jungho; Nho, Hak-Won; Cho, Jeong Bin; Kim, Dong Hyeon; Jeong, Byeong Geun; Oh, Chang-Mok; Yoon, Taewoong; Sung, Woong; Lee, Hansol; Nah, Sanghee; Kang, Boseok; Hwang, In-Wook; Jang, Joon I.; Kwon, Oh-Hoon; Rho, Junsuk; Jeong, Mun Seok; CHO, KIL WON
- Date Issued
- American Chemical Society
- We elucidated chain-extension effects of a benzo-dithiophene (BDT) and thienopyrroledione-based push-pull conjugated polymer (CP) on its exciton-dissociation mechanism within aggregate systems using transient absoption spectroscopy. The side-group extension CP with benzothiophene on the BDT unit induced H-type excitons with excess energy owing to decreased chain stiffness. This led to interchain polaron-pair (PP)-mediated exciton dissociation. The stiff side-group extended with thienothiophene on the BDT unit also induced H-type excitons, but the decreased energy and breadth of the density of states suppressed the interchain PP-mediated exciton dissociation. The main-chain-extension CP with two thiophenes on either side of the BDT unit has a curved structure disturbing the interchain packing. Thus, the driving force of exciton dissociation between the chains decreased, leading to intrachain PP-mediated exciton dissociation. Our findings can facilitate the development of novel CPs to further increase the efficiencies of polymer solar cells.
- Article Type
- Chemistry of Materials, vol. 34, no. 24, page. 10873 - 10884, 2022-12
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