Impact of Polymer Backbone Fluorination on the Charge Generation/Recombination Patterns and Vertical Phase Segregation in Bulk Heterojunction Organic Solar Cells

doi:10.3389/fchem.2020.00144

	Impact of Polymer Backbone Fluorination on the Charge Generation/Recombination Patterns and Vertical Phase Segregation in Bulk Heterojunction Organic Solar Cells
	Shao, Yanqiu 1; Chang, Yuying 1; Zhang, Suju 1; Bi, Mingyue 1; Liu, Shengjian 2; Zhang, Daliang 3; Lu, Shirong 4; Kan, Zhipeng 4
刊名	FRONTIERS IN CHEMISTRY
	2020-03-05
卷号	8 页码:8
关键词	bulk heterojunction polymer backbone fluorination charge generation and recombination vertical phase segregation organic solar cells
ISSN号	2296-2646
DOI	10.3389/fchem.2020.00144
通讯作者	Shao, Yanqiu(shaoyanqiu1969@163.com) ; Kan, Zhipeng(kanzhipeng@cigit.ac.cn)
英文摘要	Incorporating fluorine (-F) substituents along the main-chains of polymer donors and acceptors is an effective strategy toward efficient bulk-heterojunction (BHJ) solar cells. Specifically, F-substituted polymers often exhibit planar conformations, leading to favorable packing, and electronic coupling. However, the effects of fluorine substituents on the charge generation and recombination characteristics that determine the overall efficiency of BHJ active layers remain critically important issues to examine. In this report, two PBDT[2X]T polymer analogs -poly[4,8-bis((2-ethylhexyl)oxy)benzo[1,2-b:4, 5-b ']dithiophene-thiophene] [PBDT[2H]T] and its F-substituted counterpart poly[4,8-bis((2-ethylhexyl)oxy)benzo[1,2-b:4,5-b ']dithiophene-3,4-difluoro-thiophene] [PBDT[2F]T]-are studied to systematically examine how -F substituents impact the blend morphology, charge generation, carrier recombination and extraction in BHJ solar cells. Considering the large efficiency differences between PBDT[2H]T- and PBDT[2F]T-based BHJ devices, significant emphasis is given to characterizing the out-of-plane morphology of the blend films as vertical phase-separation characteristics are known to have dramatic effects on charge transport and carrier extraction in polymer-fullerene BHJ solar cells. Herein, we use electron energy loss spectroscopy (EELS) in tandem with charge transport characterization to examine PBDT[2X]T-fullerene blend films. Our analyses show that PBDT[2H]T and PBDT[2F]T possess very different charge generation, recombination and extraction characteristics, resulting from distinct aggregation, and phase-distribution within the BHJ blend films.
资助项目	National Natural Science Foundation of China[61805245] ; National Natural Science Foundation of China[2180509] ; CAS Pioneer Hundred Talents Program[Y82A060Q10] ; CAS Pioneer Hundred Talents Program[Y92A160Q10] ; Recruitment Program of Global Experts[R52A199Z10] ; Higher education teaching reform of Heilongjiang Province of China[SJGY20190688] ; Heilongjiang Provincial Department of Education's Scientific Research Project[1352MSYYB006] ; Natural Science Foundation of Chongqing[cstc2015jcyjB0628] ; Natural Science Foundation of Chongqing[cstc2017rgzn-zdyfX0030] ; Guangdong Natural Science Foundation[2016A030310428] ; Guangzhou Science and Technology Foundation[201904010361] ; Science and Technology Innovation Project of Mudanjiang Normal University[kjcx2019-22mdjnu]
WOS研究方向	Chemistry
语种	英语
出版者	FRONTIERS MEDIA SA
WOS记录号	WOS:000525093400001
内容类型	期刊论文
源URL	[http://119.78.100.138/handle/2HOD01W0/10801]
专题	中国科学院重庆绿色智能技术研究院
通讯作者	Shao, Yanqiu; Kan, Zhipeng
作者单位	1.Mudanjiang Normal Univ, Sch Chem & Chem Engn, Mudanjiang, Peoples R China 2.SCNU, Sch Chem, Guangdong Prov Engn Technol Res Ctr Mat Energy Co, Guangzhou Key Lab Mat Energy Convers & Storage, Guangzhou, Peoples R China 3.Chongqing Univ, Inst Adv Interdisciplinary Studies, Chongqing, Peoples R China 4.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Organ Semicond Res Ctr, Chongqing, Peoples R China
推荐引用方式 GB/T 7714	Shao, Yanqiu,Chang, Yuying,Zhang, Suju,et al. Impact of Polymer Backbone Fluorination on the Charge Generation/Recombination Patterns and Vertical Phase Segregation in Bulk Heterojunction Organic Solar Cells[J]. FRONTIERS IN CHEMISTRY,2020,8:8.
APA	Shao, Yanqiu.,Chang, Yuying.,Zhang, Suju.,Bi, Mingyue.,Liu, Shengjian.,...&Kan, Zhipeng.(2020).Impact of Polymer Backbone Fluorination on the Charge Generation/Recombination Patterns and Vertical Phase Segregation in Bulk Heterojunction Organic Solar Cells.FRONTIERS IN CHEMISTRY,8,8.
MLA	Shao, Yanqiu,et al."Impact of Polymer Backbone Fluorination on the Charge Generation/Recombination Patterns and Vertical Phase Segregation in Bulk Heterojunction Organic Solar Cells".FRONTIERS IN CHEMISTRY 8(2020):8.