首页|Electrochromic and photovoltaic properties of benzothiadiazole-based donor-acceptor conjugated polymers with oligo(ethylene glycol)side chains

Electrochromic and photovoltaic properties of benzothiadiazole-based donor-acceptor conjugated polymers with oligo(ethylene glycol)side chains

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Introduced oligo(ethylene glycol)(OEG)chains into high-performance donor-acceptor(D-A)type conjugated polymers is a promising strategy to control the π-π stacking,energy levels,solubility,and electrical properties.In this work,a series of novel PDTBF polymers(PDTBF-DTh,PDTBF-ThSe,and PDTBF-Th)were synthesized based on the typical benzothiadiazole-thiophene(BT-Th)-based polymer substituted with OEG side chains to investi-gate their electrochromic(EC)and photovoltaic performance.The resultant PDTBF polymers had fast switching speed(i.e.,chlorobenzene-prepared PDTBF-Th EC film:Tc~(0.9)= 1.8 s,Tb~(0.9)= 1.0 s),and high coloration effi-ciencies(i.e.,chlorobenzene-prepared PDTBF-ThSe EC film:255.50 cm~2 C~(-1)).Moreover,the PDTBF~DTh:Y6-based device shows a power conversion efficiency(PCE)of 3.11%.Due to the induced amphiphilic OEG side chains on the backbone of the conjugated polymer,these materials also exhibited green solvent processing potential.It is worth noting that these PDTBF polymers exhibited much wider optical bandgaps(1.95 eV-2.16 eV)than other reported PDTBF polymers(mostly narrow band gaps:1.40-1.70 eV),due to the format of linkage I between OEG side chains and thiophene units.It is an effective strategy to control the optical properties of the I conjugated polymers using OEG side chain engineering investigation.

Oligo(ethylene glycol)(OEG)ElectrochromicPhotovoltaicDonor-acceptor(D-A)Conjugated polymerGreen solvent

Shiying Qi、Chen Wang、Zhiyong Liu

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Key Laboratory of High-Performance Plastics(Jilin University),Ministry of Education,National & Local Joint Engineering Laboratory for Synthesis Technology ofHigh-Performance Polymer,College of Chemistry,Jilin University,XiuzhengRoad 1788,Changchun,130012,China

State Key Laboratory on Integrated Optoelectronics and College of Electronic Science & Engineering,Jilin University,Changchun,130012,China

Institute of Physics and Electronic Information,Yunnan Normal University,Kunming,650500,China

2022

10.1016/j.dyepig.2022.110432

Dyes and Pigments

Dyes and Pigments

EISCI
ISSN：0143-7208
年,卷(期)：2022.204
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