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Erschienen in: Polymer Bulletin 9/2016

27.04.2016 | Original Paper

New bulky side chain substituted benzodithiophene based 2D-conjugated polymers for optoelectronic applications

verfasst von: Kakaraparthi Kranthiraja, Sang Ho Park, Woosum Cho, Won-Tae Park, Yong-Young Noh, Sung-Ho Jin, Jae Wook Lee

Erschienen in: Polymer Bulletin | Ausgabe 9/2016

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Abstract

In order to explore the effect of bulky side chain substituted benzodithiophene (BDT) based polymers on optoelectronic properties, here we have designed and synthesized two new 2D conjugated donor–acceptor (D–A) copolymers P1 and P2 via Stille coupling of 2,3-bis(4-(2-ethylhexyloxy)phenyl)thiophene (BAPT) substituted BDT as (D) unit and 1,3-di(2-bromothien-5-yl)-5-(2-ethylhexyl)thieno[3,4-c]pyrrole-4,6-dione (TPD) or 2,5-ethylhexyl-3,6-bis(5-bromothiophen-2-yl)pyrrolo[3,4-c]-pyrrole-1,4-dione (DPP) as (A) units. The new polymers P1 and P2 showed broad absorption windows with vibronic shoulders indicate ππ stacking of polymer backbones. In addition P1 and P2 showed deep highest occupied molecular orbital (HOMO) energy levels of −5.50, −5.35 eV, respectively which allow delivering high open-circuit voltages (V oc) in bulk heterojunction polymer solar cells (BHJ PSCs). The donor photon energy loss (E g–eV oc) of P1 and P2 are 0.87 and 0.57 which is comparable to the previous reports. BHJ PSCs were fabricated with P1 and P2, and they displayed high V oc of 0.99 and 0.78 V, respectively, with maximum power conversion efficiency of 2.05 and 0.96 % in additive free BHJ PSCs. The polymer field effect transistor mobilities of P1 and P2 are 8.0 × 10−3, 9.2 × 10−5 cm2/V s, respectively.

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Metadaten
Titel
New bulky side chain substituted benzodithiophene based 2D-conjugated polymers for optoelectronic applications
verfasst von
Kakaraparthi Kranthiraja
Sang Ho Park
Woosum Cho
Won-Tae Park
Yong-Young Noh
Sung-Ho Jin
Jae Wook Lee
Publikationsdatum
27.04.2016
Verlag
Springer Berlin Heidelberg
Erschienen in
Polymer Bulletin / Ausgabe 9/2016
Print ISSN: 0170-0839
Elektronische ISSN: 1436-2449
DOI
https://doi.org/10.1007/s00289-016-1686-3

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