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Issue 19, 2015
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Influences of the backbone randomness on the properties, morphology and performances of the fluorinated benzoselenadiazole–benzothiadiazole based random copolymers

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Abstract

To investigate the influences of the 5,6-difluoro-benzoselenadiazole : 5,6-difluoro-benzothiadiazole (FBSe : FBT) ratio on the polymer properties, solid-state morphology and device performances, a series of FBSe : FBT based copolymers were synthesized. Copolymers with higher FBSe ratios were found to have narrower Eg, and higher-lying EHOMO. Because of the size and electronegativity differences of the selenium and sulfur atoms, the FBSe : FBT ratio further affects the structural regularity of the conjugated chains, and their self-assembly behaviors. DSC results indicated that P1, which has the most irregular FBSe : FBT sequence along the backbone showed the lowest Tm. Interestingly, XRD results showed that the main-chain irregularity degrades the order of the lamellar stacking, but not the order of π-stacking. The random ternary copolymers, P1 and P2, possess more ordered π-stacking than the alternating copolymers, PTh4FBSe and PTh4FBT. The highest OFET μh of 0.46 cm2 V−1 s−1 was delivered by P1, which has the smallest dπ–π among the copolymers. In the polymer : PC71BM blend films, the FBSe containing copolymers have good miscibility in PC71BM. The degree of phase separation of PTh4FBSe : PC71BM can be enhanced by DIO additive, but it is not effective for the random ternary copolymers. The highest PCE of 6.06% with Voc of 0.64 V, Jsc of 15.3 mA cm−2, and FF of 61.8% was delivered by the PTh4FBSe : PC71BM PSCs.

Graphical abstract: Influences of the backbone randomness on the properties, morphology and performances of the fluorinated benzoselenadiazole–benzothiadiazole based random copolymers

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Supplementary files

Article information


Submitted
04 Feb 2015
Accepted
31 Mar 2015
First published
01 Apr 2015

Polym. Chem., 2015,6, 3728-3736
Article type
Paper
Author version available

Influences of the backbone randomness on the properties, morphology and performances of the fluorinated benzoselenadiazole–benzothiadiazole based random copolymers

Y. Chen, T. Huang, C. Wang and C. Hsu, Polym. Chem., 2015, 6, 3728
DOI: 10.1039/C5PY00175G

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