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Fine-tuning head-to-head bithiophene-difluorobenzothiadiazole polymers for photovoltaics via side-chain engineering
Jianwei Yu1,2; Yumin Tang2; Chunyang Miao1; Kun Yang2; Xin Zhou2; Simiao Yu1; Huiliang Sun2; Jun Huang2; Han Guo2; Xugang Guo2; Guichuan Xing3; Shiming Zhang1
2019-05-01
Source PublicationOrganic Electronics: physics, materials, applications
ISSN1566-1199
Volume68Pages:135-142
Abstract

High-performance polymer semiconductors generally should have wide absorption, good solution process-ability, and fine-tuned physicochemical properties in order to achieve satisfying photovoltaic performance. Herein, two new alkynyl-functionalized electron donor units, 3-alkyl-3′-alkynyl-2,2′-bithiophene (TRTRy) and 3-alkoxy-3′-alkynyl-2,2′-bithiophene (TORTRy), were invented through the combination of the alkynyl side chain with the alkyl or alkoxy side chain, respectively. Copolymerization of these bithiophenes with difluorobenzothiadiazole (ffBT) afforded polymers ffBT-TRTRy and ffBT-TORTRy, respectively. When applied into polymer solar cells (PSCs), devices using ffBT-TRTRy donor polymer display a maximum power conversion efficiency (PCE) of 2.34% with a short-circuit current (J ) of 7.46 mA cm , an open circuit voltage (V ) of 0.93 V, and a fill factor (FF) of 34.0%. The TORTRy containing polymer ffBT-TORTRy affords PSCs with a much improved PCE of 6.60% with a higher J of 15.09 mA cm , a larger FF of 58.3%, and a V of 0.75 V. The performance improvement of PSC devices using ffBT-TORTRy donor is mainly attributed to the simultaneous realization of higher J and FF, while maintaining a good V . The results demonstrate that alkynyl-functionalized H-H bithiophenes are promising building blocks for efficient PSCs.

KeywordAlkynyl Bithiophene Conjugated Polymer Head-to-head Polymer Solar Cells
DOIhttp://doi.org/10.1016/j.orgel.2019.02.012
URLView the original
Indexed BySCI
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Physics, Applied
WOS IDWOS:000460892800020
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Cited Times [WOS]:1   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Co-First AuthorJianwei Yu
Corresponding AuthorHan Guo; Xugang Guo; Guichuan Xing; Shiming Zhang
Affiliation1.Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China
2.Department of Materials Science and Engineering and The Shenzhen Key Laboratory for Printed Organic Electronics, Southern University of Science and Technology(SUSTech), No. 1088, Xueyuan Road, Shenzhen, Guangdong, 518055, China
3.Institute of Applied Physics and Materials Engineering, University of Macau, Macao, SAR, 999078, China
Corresponding Author AffilicationINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Recommended Citation
GB/T 7714
Jianwei Yu,Yumin Tang,Chunyang Miao,et al. Fine-tuning head-to-head bithiophene-difluorobenzothiadiazole polymers for photovoltaics via side-chain engineering[J]. Organic Electronics: physics, materials, applications,2019,68:135-142.
APA Jianwei Yu.,Yumin Tang.,Chunyang Miao.,Kun Yang.,Xin Zhou.,...&Shiming Zhang.(2019).Fine-tuning head-to-head bithiophene-difluorobenzothiadiazole polymers for photovoltaics via side-chain engineering.Organic Electronics: physics, materials, applications,68,135-142.
MLA Jianwei Yu,et al."Fine-tuning head-to-head bithiophene-difluorobenzothiadiazole polymers for photovoltaics via side-chain engineering".Organic Electronics: physics, materials, applications 68(2019):135-142.
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