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Investigation of Fluorination on Donor Moiety of Donor-Acceptor 4,7-Dithienylbenzothiadiazole-Based Conjugated Polymers toward Enhanced Photovoltaic Efficiency
Li, Yonghai1; Wang, Junyi1; Liu, Yan2; Qiu, Meng1; Wen, Shuguang1; Bao, Xichang1; Wang, Ning1; Sun, Mingliang2; Yang, Renqiang1
2016-10-05
Source PublicationACS APPLIED MATERIALS & INTERFACES
Volume8Issue:39Pages:26152-26161
AbstractIt is known that fluorination on pi-conjugated donor acceptor (D-A) polymers can significantly affect the optoelectronic properties and fluorination on A moiety has been well established for design of efficient photovoltaic materials. For example, polymers based on 4,7-dithienyl-5,6-difluorobenzothiadiazole (DTffBT) have been intensively investigated and exhibited excellent performance, but the corresponding DTBT-based polymers without fluorine often display an unfavorable efficiency. With the purpose of improving photovoltaic efficiency of DTBT-based D-A polymers, we design three polymers PDTBT-TxfBT (x = 0, 1, 2) with fluorination on D moiety (TxfBT) and systematically investigate fluorination on the photophysical/electrochemical and photovoltaic properties. The results show that polymer solar cells (PSCs) based on PDTBT-TBT exhibit moderate power conversion efficiency (PCE) of 5.84%. However, the bis-fluorination on TffBT moiety (PDTBT-TffBT) can greatly enhance the molecular planarity and intermolecular interaction, improve the charge transport and heterojunction morphology, and further suppress the charge recombination losses. PSCs based on PDTBT-TffBT demonstrate obviously improved photovoltaic efficiency with the best PCE up to 7.53% without any processing additives, which ranks among the top DTBT-based PSCs. However, it should be noted that unsymmetrical fluorination on TfBT moiety (PDTBT-TfBT) impairs the regularity of polymer backbone and intermolecular interaction, increases the recombination losses, and seriously reduces the short-circuit current density and efficiency (5.44%). The results exhibit that fluorination on D moiety is a helpful strategy for design high-performance photovoltaic materials and the regularity of fluorination is crucial to improving efficiencies.
SubtypeArticle
KeywordFluorination Donor Moiety Dtbt Conjugated Polymers Photovoltaic
WOS HeadingsScience & Technology ; Technology
DOI10.1021/acsami.6b08233
WOS KeywordORGANIC SOLAR-CELLS ; OPEN-CIRCUIT VOLTAGE ; CONVERSION EFFICIENCY ; CHARGE-TRANSPORT ; SMALL MOLECULES ; DEVICE PERFORMANCE ; MORPHOLOGY CONTROL ; SIDE-CHAINS ; RECOMBINATION ; COPOLYMERS
Indexed BySCI
Language英语
WOS Research AreaScience & Technology - Other Topics ; Materials Science
Funding OrganizationNational Natural Science Foundation of China(21502205 ; China Postdoctoral Science Foundation(2015M570615 ; Outstanding Young Scientists Research Award Fund of Shandong Province(BS2014CL013) ; Youth Innovation Promotion Association CAS(2016194) ; 51573205) ; 2016T90656)
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS IDWOS:000384951800060
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qibebt.ac.cn/handle/337004/9165
Collection先进有机功能材料团队
Affiliation1.Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, CAS Key Lab Biobased Mat, Qingdao 266101, Peoples R China
2.Ocean Univ China, Inst Mat Sci & Engn, Qingdao 266100, Peoples R China
Recommended Citation
GB/T 7714
Li, Yonghai,Wang, Junyi,Liu, Yan,et al. Investigation of Fluorination on Donor Moiety of Donor-Acceptor 4,7-Dithienylbenzothiadiazole-Based Conjugated Polymers toward Enhanced Photovoltaic Efficiency[J]. ACS APPLIED MATERIALS & INTERFACES,2016,8(39):26152-26161.
APA Li, Yonghai.,Wang, Junyi.,Liu, Yan.,Qiu, Meng.,Wen, Shuguang.,...&Yang, Renqiang.(2016).Investigation of Fluorination on Donor Moiety of Donor-Acceptor 4,7-Dithienylbenzothiadiazole-Based Conjugated Polymers toward Enhanced Photovoltaic Efficiency.ACS APPLIED MATERIALS & INTERFACES,8(39),26152-26161.
MLA Li, Yonghai,et al."Investigation of Fluorination on Donor Moiety of Donor-Acceptor 4,7-Dithienylbenzothiadiazole-Based Conjugated Polymers toward Enhanced Photovoltaic Efficiency".ACS APPLIED MATERIALS & INTERFACES 8.39(2016):26152-26161.
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