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Improved open-circuit voltage of benzodithiophene based polymer solar cells using bulky terthiophene side group
Liu, Qian1,2; Bao, Xichang2; Han, Liangliang2; Gu, Chuantao2; Qiu, Meng2; Du, Zhengkun2; Sheng, Ruiying1,2; Sun, Mingliang1; Yang, Renqiang2
2015-07-01
发表期刊SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷号138页码:26-34
摘要Terthiophene, including one alpha-alpha and one branching alpha-beta connection of the thiophene units, is introduced as benzodithiophene (BDT) side chain to build a novel two-dimensional (2D) conjugated BDT block. By copolymerizing this BDT block with three electron acceptors (DTTz (bis(thiophene-2-yl)-tetrazine), DPP (diketopyrrolopyrrole), DTffBT (4,7-bis(4-hexylthienyl)-5,6-difluoro-2,1,3-benzothiadiazole)) and one electron donor (TTT (2,5-Di(2-thienyl)thiophene)), four terthiophene side-chained benzodithiophene based copolymers were synthesized. Due to the difference in electron affinity among DTTz, DPP, DTffBT and TTT, these four polymers show different UV-vis absorption spectra and optical band gaps (1.3-2.0 eV), while fortunately they all remain deep highest occupied molecular orbital (HOMO) energy levels (-5.3 to 5.6 eV) which is very favorable to high open-circuit voltage (V-oc) polymer solar cells (PSCs). By comparing the photovoltaic properties with polymers which have same backbone but do not have the bulky 2D side group in the literatures, our polymer solar cells devices show higher V-oc. Especially for PQ3 (a copolymer of benzodithiophene and diketopyrrolopyrrole), the donor photon energy loss (E-g-eV(oc)) is 0.51 eV which is almost the lowest value achieved by the researchers. It can be concluded that: the bulky terthiophene side group helps to improve V-oc of the PSCs devices. The overall performance of solar Cells devices is correlated with the molecule conformation, polymer hole mobility and polymer/PCBM blend film morphology. (C) 2015 Elsevier B.V. All rights reserved.
文章类型Article
关键词Polymer Solar Cells Open-circuit Voltage Benzodithiophene Terthiophene Side Chain
WOS标题词Science & Technology ; Technology ; Physical Sciences
DOI10.1016/j.solmat.2015.02.022
关键词[WOS]LOW-BANDGAP POLYMERS ; DEEP HOMO LEVEL ; D-A COPOLYMERS ; PHOTOVOLTAIC PROPERTIES ; CONJUGATED POLYMERS ; HIGH-PERFORMANCE ; SEMICONDUCTING POLYMERS ; CONVERSION EFFICIENCY ; TANDEM POLYMER ; BENZOTHIADIAZOLE
收录类别SCI
语种英语
WOS研究方向Energy & Fuels ; Materials Science ; Physics
WOS类目Energy & Fuels ; Materials Science, Multidisciplinary ; Physics, Applied
WOS记录号WOS:000353747600005
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文献类型期刊论文
条目标识符http://ir.qibebt.ac.cn/handle/337004/6440
专题先进有机功能材料研究组
作者单位1.Ocean Univ China, Inst Mat Sci & Engn, Qingdao 266100, Shandong, Peoples R China
2.Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, CAS Key Lab Biobased Mat, Qingdao 266101, Shandong, Peoples R China
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Liu, Qian,Bao, Xichang,Han, Liangliang,et al. Improved open-circuit voltage of benzodithiophene based polymer solar cells using bulky terthiophene side group[J]. SOLAR ENERGY MATERIALS AND SOLAR CELLS,2015,138:26-34.
APA Liu, Qian.,Bao, Xichang.,Han, Liangliang.,Gu, Chuantao.,Qiu, Meng.,...&Yang, Renqiang.(2015).Improved open-circuit voltage of benzodithiophene based polymer solar cells using bulky terthiophene side group.SOLAR ENERGY MATERIALS AND SOLAR CELLS,138,26-34.
MLA Liu, Qian,et al."Improved open-circuit voltage of benzodithiophene based polymer solar cells using bulky terthiophene side group".SOLAR ENERGY MATERIALS AND SOLAR CELLS 138(2015):26-34.
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