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, Kilwon
- Issue Date
- Feb-2022
- Publisher
- American Chemical Society
- Citation
- Journal of Physical Chemistry C, v.126, no.6, pp.3171 - 3179
- Journal Title
- Journal of Physical Chemistry C
- Volume
- 126
- Number
- 6
- Start Page
- 3171
- End Page
- 3179
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/83827
- DOI
- 10.1021/acs.jpcc.1c09233
- ISSN
- 1932-7447
- 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. ©
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