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Title:
Naphthalene substituents bonded via the beta-position: an extended conjugated moiety can achieve a decent trade-off between optical band gap and open circuit voltage in symmetry-breaking benzodithiophene-based polymer solar cells
Author: Liu, Deyu1,2; Gu, Chunyang1; Wang, Junyi1,2; Zhu, Dangqiang1; Li, Yonghai1; Bao, Xichang1; Yang, Renqiang1,3
Source: JOURNAL OF MATERIALS CHEMISTRY A
Issued Date: 2017-05-21
Volume: 5, Issue:19, Pages:9141-9147
DOI: 10.1039/c7ta01905j
DOC Type: Article
English Abstract: Bare naphthalene units bonded via the alpha- and beta-positions as side chain substituents on an asymmetric benzodithiophene (BDT) building block were employed in the design of new light-harvesting polymers for the first time. Accordingly, two D-A type polymers, based on naphthyl-substituted BDT as a D-building block and the well-known 4,7-di(thiophen-2-ethylhexyl)-5,6-difluoro-2,1,3-benzothiadiazole (DTffBT) as an acceptor unit, were synthesized. The polymer PBDT beta NPFBT with naphthalene bonded via the beta-position exhibits an appropriate pi-pi distance. The naphthalene rings efficiently broaden the absorption and narrow the optical band gap (E-g(opt)), by extending the degree of pi-conjugation, which is beneficial for capturing more photons and thus improving the short-circuit current density (J(SC)). Meanwhile, PBDT beta NPFBT-based devices also exhibit a desirable high open circuit voltage (V-OC), due to the low saturation dark current density (J(S)) arising from the exactly appropriate pi-pi distance. As a result, the power conversion efficiency (PCE) of 9.80% for the PBDT beta NPFBT/PC71BM-based PSC is the highest efficiency ever obtained among the reported BDT and DTBT backbone photovoltaic polymers. In addition, a PCE of 7.33% was obtained for PBDT beta NPFBT/ITIC without any treatment, which is also impressive for non-fullerene PSCs. Thus, it can be concluded that a naphthyl unit bonded via the beta-position can lead to a better trade-off between E-g(opt) and V-OC, ultimately increasing the PCE dramatically.
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 ; ELECTRON-ACCEPTOR ; PHOTOVOLTAIC PERFORMANCE ; ORGANIC PHOTOVOLTAICS ; QUANTUM EFFICIENCY ; DONOR ; MORPHOLOGY ; DESIGN ; AGGREGATION ; ORIENTATION
Indexed Type: SCI
Funder: Ministry of Science and Technology of China(2014CB643501 ; National Natural Science Foundation of China(21502205 ; Youth Innovation Promotion Association CAS(2016194) ; 2010DFA52310) ; 21604092 ; 51573205)
Language: 英语
WOS ID: WOS:000401316100037
Citation statistics:
Content Type: 期刊论文
URI: http://ir.qibebt.ac.cn/handle/337004/9606
Appears in Collections:先进有机功能材料团队_期刊论文

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description.institution: 1.Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, CAS Key Lab Biobased Mat, Qingdao 266101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510641, Guangdong, Peoples R China

Recommended Citation:
Liu, Deyu,Gu, Chunyang,Wang, Junyi,et al. Naphthalene substituents bonded via the beta-position: an extended conjugated moiety can achieve a decent trade-off between optical band gap and open circuit voltage in symmetry-breaking benzodithiophene-based polymer solar cells[J]. JOURNAL OF MATERIALS CHEMISTRY A,2017,5(19):9141-9147.
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