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Issue 3, 2015
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Correlation of structure and photovoltaic performance of benzo[1,2-b:4,5-b′]dithiophene copolymers alternating with different acceptors

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Abstract

Four π-conjugated benzo[1,2-b:4,5-b′]dithiophene (BDT) based polymers were synthesized for application in polymer solar cells. These polymers possessed desirable HOMO/LUMO levels for polymer photovoltaic applications. PBDTT–TTz and PBDTT–DTBT displayed strong absorption in the range of 300–650 nm, while PBDTT–DPP and PBDTT–TTDPP showed a further 100 nm extended absorption band. The lowest unoccupied molecular orbital energy levels of polymers were tuned effectively from −3.34 eV to −3.81 eV by fusing with different accepting units. A maximum power conversion efficiency of 2.60% was obtained from photovoltaic cells with a PBDTT–TTz : PC61BM (1 : 2, w/w) blend film as the active layer, with a short circuit current density of 8.37 mA cm−2, an open circuit voltage of 0.70 V, and a fill factor of 44.3%.

Graphical abstract: Correlation of structure and photovoltaic performance of benzo[1,2-b:4,5-b′]dithiophene copolymers alternating with different acceptors

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Supplementary files

Article information


Submitted
30 Nov 2014
Accepted
16 Jan 2015
First published
16 Jan 2015

New J. Chem., 2015,39, 2248-2255
Article type
Paper

Correlation of structure and photovoltaic performance of benzo[1,2-b:4,5-b′]dithiophene copolymers alternating with different acceptors

J. Yu, B. Zhao, X. Nie, B. Zhou, Y. Li, J. Hai, E. Zhu, L. Bian, H. Wu and W. Tang, New J. Chem., 2015, 39, 2248
DOI: 10.1039/C4NJ02192D

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