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Issue 8, 2012
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A conjugated polymer based on 5,5′-bibenzo[c][1,2,5]thiadiazole for high-performance solar cells

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Abstract

Based on a new n-type building block 5,5′-bibenzo[c][1,2,5]thiadiazole (BBT), we designed and synthesized a carbazole–BBT D–A copolymer (P1), and compared it with its carbazolebenzo[c][1,2,5]thiadiazole (BT) analog P2. P1 has good solubility in common organic solvents, while P2 has poor solubility. In films, P1 and P2 exhibit absorption maxima at 565 and 614 nm, respectively. The HOMO level of P1 is −5.51 eV, 0.18 eV lower than that of P2, while the LUMO level of P1 is −3.56 eV, slightly lower than that of P2. The low-lying energy levels and blue-shifted absorption of P1 are attributed to the stronger electron-withdrawing ability of BBT and the twisted main chain of P1. The field-effect hole mobility of P1 is 2 × 10−3 cm2 V−1 s−1. Polymer solar cells based on P1:PC71BM (1 : 3, w/w) exhibit a power conversion efficiency up to 3.7% with a high open circuit voltage of 0.98 V under an AM 1.5 simulated solar light at 100 mW cm−2.

Graphical abstract: A conjugated polymer based on 5,5′-bibenzo[c][1,2,5]thiadiazole for high-performance solar cells

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Supplementary files

Article information


Submitted
31 Aug 2011
Accepted
23 Nov 2011
First published
16 Jan 2012

J. Mater. Chem., 2012,22, 3432-3439
Article type
Paper

A conjugated polymer based on 5,5′-bibenzo[c][1,2,5]thiadiazole for high-performance solar cells

H. Wang, P. Cheng, Y. Liu, J. Chen, X. Zhan, W. Hu, Z. Shuai, Y. Li and D. Zhu, J. Mater. Chem., 2012, 22, 3432
DOI: 10.1039/C2JM14283J

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