Structural Tuning of Low Band Gap Intermolecular Push/Pull Side-chain Polymers for Organic Photovoltaic Applications

A series of novel low band gap donor-acceptor （D-A） type organic co-polymers （BT-F-TPA, BT-CZ-TPA and BT-SI-TPA） consisting of electron-deficient acceptor blocks both in main chains （M1） and at the pendant （M2） were polymerized with different electron rich donor （M3-M5） blocks, i.e., 9,9-dihexyl-9H-...

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Bibliographic Details
Published in:Chinese journal of polymer science 2017-09, Vol.35 (9), p.1073-1085
Main Authors: Nayak, Ansuman, Rama Sreekanth, P. S., Sahu, Santosh Kumar, Sahu, Duryodhan
Format: Article
Language:English
Subjects:
Band gap
Butyric acid
Chains (polymeric)
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Copolymers
Current density
Energy conversion efficiency
Illumination
Industrial Chemistry/Chemical Engineering
Open circuit voltage
Photovoltaic cells
Polymer Sciences
Polymerization
Polymers
Solar cells
White light
侧链聚合物
光伏器件
分子间
功率转换效率
带隙
应用
电子受体
结构调整
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Summary:A series of novel low band gap donor-acceptor （D-A） type organic co-polymers （BT-F-TPA, BT-CZ-TPA and BT-SI-TPA） consisting of electron-deficient acceptor blocks both in main chains （M1） and at the pendant （M2） were polymerized with different electron rich donor （M3-M5） blocks, i.e., 9,9-dihexyl-9H-fluorene, N-alkyl-2,7-carbazole, and 2,6-dithinosilole, respectively, via Suzuki method. These polymers exhibited relatively low band gaps （1.65-1.88 eV） and broad absorption ranges （680-740 nm）. Bulk heterojunction （BHJ） solar cells incorporating these polymers as electron donors, blended with [6,6]-phenyl-C61-butyric acid methyl ester （PC61BM） or [6,6]-phenyl-Cvl-butyric acid methyl ester （PC71BM） as electron-acceptors in different weight ratios were fabricated and tested under 100 mW/cm2 of AM 1.5 with white-light illumination. The photovoltaic device containing donor BT-SI-TPA and acceptor PC71BM in 1：2 weight ratio showed the best power conversion efficiency （PCE） value of 1.88%, with open circuit voltage （Voc） = 0.75 V, short circuit current density （Jsc） = 7.60 mA/cm2, and fill factor （FF） = 33.0%.
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-017-1967-9