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Polymers 2019, 11(3), 408; https://doi.org/10.3390/polym11030408

Effect of Post-Thermal Annealing on the Performance and Charge Photogeneration Dynamics of PffBT4T-2OD/PC71BM Solar Cells

1
School of Physics and Electronic Engineering, Guangzhou University, Guangzhou 510006, China
2
Research Institute for New Materials Technology, Chongqing University of Arts and Science, Chongqing 402160, China
3
NanoLund and Division of Chemical Physics, Lund University, Lund 22100, Sweden
*
Authors to whom correspondence should be addressed.
Received: 29 December 2018 / Revised: 5 February 2019 / Accepted: 26 February 2019 / Published: 2 March 2019
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Abstract

In this work, we studied influence of post thermal annealing on the performance and charge photogeneration processes of PffBT4T-2OD/PC71BM solar cells. As-prepared device exhibits a high-power conversion efficiency of 9.5%, much higher than that after thermal annealing. To understand this phenomenon, we studied charge photogeneration processes in these solar cells by means of time resolved spectroscopy. We associate the degradation of solar cell performance with the reduction of exciton dissociation efficiency and with increased bimolecular recombination of photogenerated charges as a result of annealing. We correlate the generation of localized PffBT4T-2OD polarons observed via spectro-electrochemical measurements with enhancement of the bimolecular charge recombination of annealed solar cells. View Full-Text
Keywords: polymer solar cell; power conversion efficiency; charge generation; thermal annealing polymer solar cell; power conversion efficiency; charge generation; thermal annealing
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Zhang, W.; Hu, R.; Zeng, X.; Su, X.; Chen, Z.; Zou, X.; Peng, J.; Zhang, C.; Yartsev, A. Effect of Post-Thermal Annealing on the Performance and Charge Photogeneration Dynamics of PffBT4T-2OD/PC71BM Solar Cells. Polymers 2019, 11, 408.

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