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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, DONGKILEE, JAEWONSIN, DONG HUNHAN, SE GYOLEE, HANSOLCHOI, WOOKJINKIM, HYOJUNGNOH, JAEBUMMUN, JUNGHOSUNG, WOONGKIM, SANG WOOJEONG, BYEONG GEUNKIM, SUNG HYUKRHO, JUNSUKJEONG, MUN SEOKCHO, 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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조길원CHO, KIL WON
Dept. of Chemical Enginrg
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