Intrachain Delocalization Effect of Charge Carriers on the Charge-Transfer State Dynamics in Organic Solar Cells
- Authors
- Lee, D.[Lee, D.]; Lee, J.[Lee, J.]; Sin, D.H.[Sin, D.H.]; Han, S.G.[Han, S.G.]; Lee, H.[Lee, H.]; Choi, W.[Choi, W.]; Kim, H.[Kim, H.]; Noh, J.[Noh, J.]; Mun, J.[Mun, J.]; Sung, W.[Sung, W.]; Kim, S.W.[Kim, S.W.]; Jeong, B.G.[Jeong, B.G.]; Kim, S.H.[Kim, S.H.]; Rho, J.[Rho, J.]; Jeong, M.S.[Jeong, M.S.]; Cho, K.[Cho, K.]
- Issue Date
- 17-Feb-2022
- Publisher
- American Chemical Society
- Citation
- Journal of Physical Chemistry C, v.126, no.6, pp.3171 - 3179
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Physical Chemistry C
- Volume
- 126
- Number
- 6
- Start Page
- 3171
- End Page
- 3179
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/95676
- 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. © 2022 American Chemical Society
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