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Title:
Efficient fullerene-free solar cells with wide optical band gap polymers based on fluorinated benzotriazole and asymmetric benzodithiophene
Author: Liu, Zhe1; Liu, Deyu2,4; Zhang, Kaili1; Zhu, Tingting1; Zhong, Yaqian1; Li, Feng3; Li, Yonghai2; Sun, Mingliang1; Yang, Renqiang2
Source: JOURNAL OF MATERIALS CHEMISTRY A
Issued Date: 2017-11-07
Volume: 5, Issue:41, Pages:21650-21657
DOI: 10.1039/c7ta07390a
DOC Type: Article
English Abstract: In this work, alpha- and beta-position naphthalene substituents as side chains on asymmetric BDT were used as donor building blocks to build wide bandgap (WBG) donor materials (P alpha NBDT-T1 and P beta NBDT-T1) with fluorinated benzotriazole (T1) as the acceptor unit. The two co-polymers were used to build polymer solar cells (PSCs) with PC71BM or ITIC acceptor material. In ITIC acceptor material based devices, the P alpha NBDT-T1 co-polymer with a larger dihedral angle between main backbone and naphthalene ring achieved a higher power conversion efficiency (PCE) of 9.60% with improved short-circuit current density (J(SC)) and fill factor (FF) compared with P beta NBDT-T1, which was ascribed to the excellent morphology of the blended film. The open circuit voltage (V-OC) was also maintained at a decent level upon introducing these naphthalene rings due to their high ionization potential and low electron density. Interestingly, for PC71BM based devices, the two polymers show a reverse situation compared with an ITIC system. The P beta NBDT-T1 with a small dihedral angle between the main backbone and naphthalene rings shows a slightly higher performance than P alpha NBDT-T1. However, in the PC71BM system, both polymers did not exhibit ideal optical performance due to their unmatched absorption spectrum. These phenomena indicate that the asymmetric BDTs have great potential towards achieving high optical performance with non-fullerene acceptor materials.
WOS Headings: Science & Technology ; Physical Sciences ; Technology
WOS Subject: Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS Subject Extended: Chemistry ; Energy & Fuels ; Materials Science
WOS Keyword Plus: POWER CONVERSION EFFICIENCY ; MOLECULE ELECTRON-ACCEPTORS ; ORGANIC PHOTOVOLTAICS ; ACHIEVE ; DONOR
Indexed Type: SCI
Funder: NSFC(51773220 ; 51573205 ; 21274134)
Language: 英语
WOS ID: WOS:000413734800004
Citation statistics:
Content Type: 期刊论文
URI: http://ir.qibebt.ac.cn/handle/337004/9695
Appears in Collections:先进有机功能材料团队_期刊论文

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description.institution: 1.Ocean Univ China, Inst Mat Sci & Engn, Qingdao 266100, Peoples R China
2.Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, CAS Key Lab Biobased Mat, Qingdao 266101, Peoples R China
3.Qingdao Univ Sci & Technol, Sch Polymer Sci & Engn, Minist Educ Shandong Prov, Key Lab Rubber Plast, 53 Zhengzhou Rd, Qingdao 266042, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Liu, Zhe,Liu, Deyu,Zhang, Kaili,et al. Efficient fullerene-free solar cells with wide optical band gap polymers based on fluorinated benzotriazole and asymmetric benzodithiophene[J]. JOURNAL OF MATERIALS CHEMISTRY A,2017,5(41):21650-21657.
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