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Asymmetric medium bandgap copolymers and narrow bandgap small-molecule acceptor with over 7% efficiency

To further investigate non-fullerene polymer solar cells based-thieno[2,3-f]benzofuran (TBF) polymers, we designed and synthesized two medium bandgap TBF-based polymers, namely TBF-BDD and TBF-BT, containing alkoxyphenyl substituted TBF electron-donor unit, 1,3-bis(thiophen-2-yl)-5,7-bis(2-ethylhexy... Full description

Contained in: Organic Electronics Vol. 45 (2017), p. 42-48
Journal Title: Organic Electronics
Fulltext access:
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Links: Additional Link (dx.doi.org)
Additional Keywords: BANDLUECKE
BELEUCHTUNG
BENZO:B:FURAN
COPOLYMER
ELEKTRON
ENERGIEUMWANDLUNG
FULLEREN
PHOTOELEMENT
SOLARZELLE
STOFFGEMISCH
DOI: 10.1016/j.orgel.2017.02.029
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 7 Seiten, 30 Quellen
ID (e.g. DOI, URN): 10.1016/j.orgel.2017.02.029
PPN (Catalogue-ID): WTI004842987
Note: WTI TEMA DB
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520 |a To further investigate non-fullerene polymer solar cells based-thieno[2,3-f]benzofuran (TBF) polymers, we designed and synthesized two medium bandgap TBF-based polymers, namely TBF-BDD and TBF-BT, containing alkoxyphenyl substituted TBF electron-donor unit, 1,3-bis(thiophen-2-yl)-5,7-bis(2-ethylhexyl)benzo-[1,2-c:4,5-c′]dithiophene-4,8-dione (BDD) and 4,7-di(thiophen-2-yl)-5,6-dioctyloxybenzo[c][1,2,5]thiadiazole (BT) electron-acceptor segment, respectively. When blended with ITIC (a n-type small molecule acceptor), two polymer:ITIC blends possess better complementary absorption than the absorption with PC71BM. The properties, including charge mobilities, and morphologies have been intensively investigated. The polymer solar cells based on TBF-BDD:ITIC and TBF-BT:ITIC (1:1,w/w) exhibited promising power conversion efficiencies (PCEs) of 7.13% and 7.03%, respectively, under the illumination of AM 1.5 G, 100 mW/cm2, which are higher in comparison with fullerene-based devices. Up to now, these PCEs are the highest among TBF-based polymer photovoltaic devices. [Copyright Elsevier B.V. Reproduced with permission.] 
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