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Title: A Chlorinated π-Conjugated Polymer Donor for Efficient Organic Solar Cells

Abstract

In this manuscript, we designed and synthesized a chlorinated benzothiadiazole-T4 polymer donor, PBT4T-Cl, in which a chorine atom had been introduced at the 4-position in the middle thiophene unit to fine tune the energy level of the final polymers. The chlorine substitution of the thiophene moiety enables the fine-tuning of the HOMO energy level of the corresponding polymer as well as the charge carrier mobility and the morphologies of the blend film, eventually improving its photovoltaic properties. Compared with its nonchlorinated analog, the PBT4T-Cl-based devices exhibited clear increases in open-circuit voltage and fill factor, achieving PCEs up to 11.18% without device annealing, which is the highest PCE of a chlorine-based PSC reported to date. GIWAXS analysis illustrated the strong crystallinity from the blend film, and AFM and TEM measurements both revealed an optimized morphology of the spin-coated PBT4T-Cl/PC71BM film without thermal annealing, all of which supported the PCE enhancement of chlorine-substituted benzothiadiazole-T4 polymer, and chlorine atoms attached to a suitable backbone would obviously promote the performance of polymer solar cells. More importantly, the PBT4T-Cl-based devices showed superior stability, with a PCE of 8.16% after 50 days device storage, while the PffBT4T-2OD-based devices remained at only 5.36% in a parallel experiment.

Authors:
; ; ; ; ; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Basic Research Program of China; USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1475566
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Joule
Additional Journal Information:
Journal Volume: 2; Journal Issue: 8; Journal ID: ISSN 2542-4351
Publisher:
Elsevier - Cell Press
Country of Publication:
United States
Language:
English
Subject:
chlorination; open-circuit voltage; polymer solar cells; scale up; stability

Citation Formats

Chen, Hui, Hu, Zhiming, Wang, Huan, Liu, Longzhu, Chao, Pengjie, Qu, Jianfei, Chen, Wei, Liu, Anhua, and He, Feng. A Chlorinated π-Conjugated Polymer Donor for Efficient Organic Solar Cells. United States: N. p., 2018. Web. doi:10.1016/j.joule.2018.05.010.
Chen, Hui, Hu, Zhiming, Wang, Huan, Liu, Longzhu, Chao, Pengjie, Qu, Jianfei, Chen, Wei, Liu, Anhua, & He, Feng. A Chlorinated π-Conjugated Polymer Donor for Efficient Organic Solar Cells. United States. doi:10.1016/j.joule.2018.05.010.
Chen, Hui, Hu, Zhiming, Wang, Huan, Liu, Longzhu, Chao, Pengjie, Qu, Jianfei, Chen, Wei, Liu, Anhua, and He, Feng. Wed . "A Chlorinated π-Conjugated Polymer Donor for Efficient Organic Solar Cells". United States. doi:10.1016/j.joule.2018.05.010.
@article{osti_1475566,
title = {A Chlorinated π-Conjugated Polymer Donor for Efficient Organic Solar Cells},
author = {Chen, Hui and Hu, Zhiming and Wang, Huan and Liu, Longzhu and Chao, Pengjie and Qu, Jianfei and Chen, Wei and Liu, Anhua and He, Feng},
abstractNote = {In this manuscript, we designed and synthesized a chlorinated benzothiadiazole-T4 polymer donor, PBT4T-Cl, in which a chorine atom had been introduced at the 4-position in the middle thiophene unit to fine tune the energy level of the final polymers. The chlorine substitution of the thiophene moiety enables the fine-tuning of the HOMO energy level of the corresponding polymer as well as the charge carrier mobility and the morphologies of the blend film, eventually improving its photovoltaic properties. Compared with its nonchlorinated analog, the PBT4T-Cl-based devices exhibited clear increases in open-circuit voltage and fill factor, achieving PCEs up to 11.18% without device annealing, which is the highest PCE of a chlorine-based PSC reported to date. GIWAXS analysis illustrated the strong crystallinity from the blend film, and AFM and TEM measurements both revealed an optimized morphology of the spin-coated PBT4T-Cl/PC71BM film without thermal annealing, all of which supported the PCE enhancement of chlorine-substituted benzothiadiazole-T4 polymer, and chlorine atoms attached to a suitable backbone would obviously promote the performance of polymer solar cells. More importantly, the PBT4T-Cl-based devices showed superior stability, with a PCE of 8.16% after 50 days device storage, while the PffBT4T-2OD-based devices remained at only 5.36% in a parallel experiment.},
doi = {10.1016/j.joule.2018.05.010},
journal = {Joule},
issn = {2542-4351},
number = 8,
volume = 2,
place = {United States},
year = {2018},
month = {8}
}