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

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Yongfang Liu, Yao Hu, Wenping Shuai, Zhigang Zhu, Daoben Chen, Jianming Zhan, Xiaowei Wang, Haifeng Cheng, Pei
Copyright Year	2012
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 carbazole–benzo[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.
Starting Page	3432
Ending Page	3439
Page Count	8
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	8
Journal	Journal of Materials Chemistry
DOI	10.1039/c2jm14283j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	BBT Extrinsic semiconductor Copolymer BT Group Electronvolt Amplitude modulation
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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