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Structural and morphological tuning of dithienobenzodithiophene-core small molecules for efficient solution processed organic solar cells

Title
Structural and morphological tuning of dithienobenzodithiophene-core small molecules for efficient solution processed organic solar cells
Authors
Jung, MinwooSeo, DongkyunKwak, KyungwonKim, AjeongCha, WonsukKim, HyunjungYoon, YoungwoonKo, Min JaeLee, Doh-KwonKim, Jin YoungSon, Hae JungKim, BongSoo
Ewha Authors
김봉수
SCOPUS Author ID
김봉수scopus
Issue Date
2015
Journal Title
DYES AND PIGMENTS
ISSN
0143-7208JCR Link

1873-3743JCR Link
Citation
DYES AND PIGMENTS vol. 115, pp. 23 - 34
Keywords
Organic solar cellsPower conversion efficiencyOrganic semiconductorsConjugated small moleculesCrystallinityNanoscale phase separation
Publisher
ELSEVIER SCI LTD
Indexed
SCI; SCIE; SCOPUS WOS
Document Type
Article
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. (C) 2014 Elsevier Ltd. All rights reserved.
DOI
10.1016/j.dyepig.2014.12.003
Appears in Collections:
사범대학 > 과학교육과 > Journal papers
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