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Kim, BongSoo
Polymer & Organic Semiconductor Lab.
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Structural and morphological tuning of dithienobenzodithiophene-core small molecules for efficient solution processed organic solar cells

Author(s)
Jung, MinwooSeo, DongkyunKwak, KyungwonKim, AjeongCha, WonsukKim, HyunjungYoon, YoungwoonKo, Min JaeLee, Doh-KwonKim, Jin YoungSon, Hae JungKim, BongSoo
Issued Date
2015-04
DOI
10.1016/j.dyepig.2014.12.003
URI
https://scholarworks.unist.ac.kr/handle/201301/24780
Fulltext
https://www.sciencedirect.com/science/article/pii/S0143720814004574?via%3Dihub
Citation
DYES AND PIGMENTS, v.115, pp.23 - 34
Abstract
The fused dithieno[2,3-d:2',3'-d']benzo[1,2-b:4,5-b']dithiophene (DTBDT) structure was coupled with diketopyrrolopyrrole (DPP) moieties to generate highly planar bis(2,5-bis(2-ethylhexyl)-3,6-di(thiophen-2-yl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione)dithieno[2,3-d:2',3'-d]benzo[1,2-b:4,5-b']dithiophene (DTBDTDPP-EH) and bis(2,5-bis(2-butyloctyl)-3,6-di(thiophen-2-yl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione)dithieno[2,3-d:2',3'-d']benzo[1,2-b:4,5-b']dithiophene (DTBDTDPP-BO) molecules, where the EH and BO stands for 2-ethylhexyl and 2-butyloctyl groups respectively. The morphology of the DTBDTDPP-EH alone or DTBDTDPP-EH:[6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) blend film was controlled using post-thermal annealing at 130 degrees C or addition of 1,8-diiodooctane (DIO) additives. The DIO-additive treatment was more effective than thermal annealing at increasing crystallinity; the DIOadditives promoted the formation of nanoscopically well-connected molecular crystalline domains in the blend films. This observation well explained the ordering of the photovoltaic properties of DTBDTDPP-EH:PCBM devices: from worst to best, as-cast, thermally treated, and DIO-treated photoactive films. The DTBDTDPP-BO:PCBM device followed the similar trend with lower performances due to the presence of irregularly overgrown domains. Overall, we demonstrate that it is critical to optimize nanoscale film morphologies by engineering alkyl chains and selecting an appropriate processing method.
Publisher
ELSEVIER SCI LTD
ISSN
0143-7208
Keyword (Author)
Organic solar cellsPower conversion efficiencyOrganic semiconductorsConjugated small moleculesCrystallinityNanoscale phase separation
Keyword
HIGH PHOTOVOLTAIC EFFICIENCYLOW-BANDGAP POLYMERSHIGH-PERFORMANCEBENZODITHIOPHENE UNITSOLVENT ADDITIVESDIKETOPYRROLOPYRROLEOPTIMIZATIONAGGREGATIONDEVICESCATHODE

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