Synthesis of dithieno[2,3-d:2-3-d’]benzo[1,2-b:4,5-b’]dithiophene -alt-isoindigo conjugated polymer and enhancement of photovoltai

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Synthesis of dithieno[2,3-d:2-3-d’]benzo[1,2-b:4,5-b’]dithiophene -alt-isoindigo conjugated polymer and enhancement of photovoltai

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作者：Yangjun Xia (1)
Heng Zhang (1)
Jianfeng Li (1)
Junfeng Tong (1)
Peng Zhang (1)
Chunyan Yang (1)
关键词：Conjugated polymer ; Dithieno[2 ; 3 ; d ; 2-3-d’]benzo[1 ; 2 ; b ; 4 ; 5 ; b’]di ; thiophene ; Isoindigo ; Morphology ; Synthesis
刊名：Journal of Polymer Research
出版年：2015
出版时间：January 2015
年：2015
卷：22
期：1
全文大小：1,467 KB
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作者单位：Yangjun Xia (1)
Heng Zhang (1)
Jianfeng Li (1)
Junfeng Tong (1)
Peng Zhang (1)
Chunyan Yang (1)

1. Key Lab of Optoelectronic Technology and Intelligent Control of Education Ministry, Lanzhou Jiaotong University, Gansu Province, Lanzhou, 730070, China
ISSN：1572-8935

文摘

An alternating low band gap conjugated polymer derived from 5.10-di(2-ethylhexyloxy)dithieno[2,3-d:2-3-d’]benzo[1,2-b:4,5-b’]dithiophene (DTBDT) and isoindigo derivative (ID), was synthesized and characterized. The polymer exhibits good solubility in organic solvent and extensive absorption from 350 to 780?nm with the highest occupied molecular orbital (HOMO) level of ?.38?eV and lowest unoccupied molecular orbital (LUMO) level of ?.80?eV. In spite of those, the power conversion efficiency (PCE) of 0.21?% for the photovoltaic cells (PVCs) from the blend of the polymer and [6, 6]-phenyl-C71-butyric acid methyl ester (PC71BM) is very low. Interestingly, the performances of the PVCs from the polymer are remarkably increased while a very small amount of diphenyl sulfide (DPS) is used as solvent additives, and the maximal PCE of 4.43?% is achieved in the PVCs from the blend of polymer and PC71BM (W:W, 1:1.5) with DPS as solvent additives under 100?mW/cm2 illumination (AM 1.5G).