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

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

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...

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Main Authors: Wei Zhang, Rong Hu, Xiaokang Zeng, Xiaojun Su, Zhifeng Chen, Xianshao Zou, Jun Peng, Chengyun Zhang, Arkady Yartsev
Format: Article
Language:English
Published: MDPI AG 2019-03-01
Series:Polymers
Subjects:
polymer solar cell
power conversion efficiency
charge generation
thermal annealing
Online Access:http://www.mdpi.com/2073-4360/11/3/408
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spelling doaj-c4a318ad3a1d4e89aa674179430524e32020-11-25T01:10:17ZengMDPI AGPolymers2073-43602019-03-0111340810.3390/polym11030408polym11030408Effect of Post-Thermal Annealing on the Performance and Charge Photogeneration Dynamics of PffBT4T-2OD/PC71BM Solar CellsWei Zhang0Rong Hu1Xiaokang Zeng2Xiaojun Su3Zhifeng Chen4Xianshao Zou5Jun Peng6Chengyun Zhang7Arkady Yartsev8School of Physics and Electronic Engineering, Guangzhou University, Guangzhou 510006, ChinaResearch Institute for New Materials Technology, Chongqing University of Arts and Science, Chongqing 402160, ChinaResearch Institute for New Materials Technology, Chongqing University of Arts and Science, Chongqing 402160, ChinaNanoLund and Division of Chemical Physics, Lund University, Lund 22100, SwedenSchool of Physics and Electronic Engineering, Guangzhou University, Guangzhou 510006, ChinaNanoLund and Division of Chemical Physics, Lund University, Lund 22100, SwedenSchool of Physics and Electronic Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Physics and Electronic Engineering, Guangzhou University, Guangzhou 510006, ChinaNanoLund and Division of Chemical Physics, Lund University, Lund 22100, SwedenIn 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.http://www.mdpi.com/2073-4360/11/3/408polymer solar cellpower conversion efficiencycharge generationthermal annealing
collection DOAJ
language English
format Article
sources DOAJ
author Wei Zhang
Rong Hu
Xiaokang Zeng
Xiaojun Su
Zhifeng Chen
Xianshao Zou
Jun Peng
Chengyun Zhang
Arkady Yartsev
spellingShingle Wei Zhang
Rong Hu
Xiaokang Zeng
Xiaojun Su
Zhifeng Chen
Xianshao Zou
Jun Peng
Chengyun Zhang
Arkady Yartsev
Effect of Post-Thermal Annealing on the Performance and Charge Photogeneration Dynamics of PffBT4T-2OD/PC71BM Solar Cells
Polymers
polymer solar cell
power conversion efficiency
charge generation
thermal annealing
author_facet Wei Zhang
Rong Hu
Xiaokang Zeng
Xiaojun Su
Zhifeng Chen
Xianshao Zou
Jun Peng
Chengyun Zhang
Arkady Yartsev
author_sort Wei Zhang
title Effect of Post-Thermal Annealing on the Performance and Charge Photogeneration Dynamics of PffBT4T-2OD/PC71BM Solar Cells
title_short Effect of Post-Thermal Annealing on the Performance and Charge Photogeneration Dynamics of PffBT4T-2OD/PC71BM Solar Cells
title_full Effect of Post-Thermal Annealing on the Performance and Charge Photogeneration Dynamics of PffBT4T-2OD/PC71BM Solar Cells
title_fullStr Effect of Post-Thermal Annealing on the Performance and Charge Photogeneration Dynamics of PffBT4T-2OD/PC71BM Solar Cells
title_full_unstemmed Effect of Post-Thermal Annealing on the Performance and Charge Photogeneration Dynamics of PffBT4T-2OD/PC71BM Solar Cells
title_sort effect of post-thermal annealing on the performance and charge photogeneration dynamics of pffbt4t-2od/pc71bm solar cells
publisher MDPI AG
series Polymers
issn 2073-4360
publishDate 2019-03-01
description 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.
topic polymer solar cell
power conversion efficiency
charge generation
thermal annealing
url http://www.mdpi.com/2073-4360/11/3/408
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