Intrachain Delocalization Effect of Charge Carriers on the Charge-Transfer State Dynamics in Organic Solar Cells
SCIE
SCOPUS
- Title
- Intrachain Delocalization Effect of Charge Carriers on the Charge-Transfer State Dynamics in Organic Solar Cells
- Authors
- LEE, DONGKI; LEE, JAEWON; SIN, DONG HUN; HAN, SE GYO; LEE, HANSOL; CHOI, WOOKJIN; KIM, HYOJUNG; NOH, JAEBUM; MUN, JUNGHO; SUNG, WOONG; KIM, SANG WOO; JEONG, BYEONG GEUN; KIM, SUNG HYUK; RHO, JUNSUK; JEONG, MUN SEOK; CHO, KIL WON
- Date Issued
- 2022-02
- Publisher
- American Chemical Society
- Abstract
- We studied the charge-generation mechanism in low-bandgap polymer (P4TNTz-2F)-fullerene bulk heterojunction (BHJ) organic solar cells (OSCs) using transient absorption (TA) spectroscopy. The highly crystalline nanowire structure of P4TNTz-2F in a blend film prepared with chlorobenzene (CB) and 1,8-diiodooctane (DIO) induced more long-lived charge carriers than those in a blend film prepared with CB only. Pump-wavelength-dependent TA data revealed that the increased charge-delocalization by the intrachain ordering of P4TNTz-2F in the blend film prepared with CB/DIO is the key factor to increasing the OSC efficiency. The intrachain charge-delocalization increased the charge-transfer (CT) state lifetime and suppressed geminate recombination losses, resulting in the efficient dissociation of CT states into free carriers. Our findings provide new insights into the excited-state dynamics study of BHJ blends, which can serve as a good guide for the development of novel OSC materials.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/110284
- DOI
- 10.1021/acs.jpcc.1c09233
- ISSN
- 1932-7447
- Article Type
- Article
- Citation
- Journal of Physical Chemistry C, vol. 126, no. 6, page. 3171 - 3179, 2022-02
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