Effect of Alkyl Side Chains on the Photovoltaic Performance of 2,1,3‐Benzoxadiazole‐Based (‐X‐DADAD‐)n‐Type Copolymers

A family of novel (X‐TATAT)n‐type conjugated polymers based on the carbazole (X), thiophene (T), and benzoxadiazole (A) moieties is designed and explored as electron‐donor materials for organic bulk heterojunction solar cells. Incorporation of the branched side chains of different size and shape aff...

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Bibliographic Details
Published in:Macromolecular chemistry and physics 2017-08, Vol.218 (15), p.n/a
Main Authors: Klimovich, Irina V., Susarova, Diana K., Inasaridze, Liana N., Akkuratov, Alexander V., Chernyak, Alexander. V., Troshin, Pavel A.
Format: Article
Language:English
Subjects:
benzoxadiazole
Chain branching
Chains (polymeric)
Circuits
conjugated polymers
Copolymers
Crystal structure
Donor materials
Energy levels
Optoelectronics
Photovoltaic cells
polymer solar cells
Polymers
Solar cells
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Summary:A family of novel (X‐TATAT)n‐type conjugated polymers based on the carbazole (X), thiophene (T), and benzoxadiazole (A) moieties is designed and explored as electron‐donor materials for organic bulk heterojunction solar cells. Incorporation of the branched side chains of different size and shape affects significantly the optoelectronic properties of the materials, particularly frontier energy levels of polymers translated to the open circuit voltages of the photovoltaic cells. The revealed unprecedented correlation between the parameters of the solar cells (VOC, fill factor (FF), JSC) and bulkiness of the alkyl side chains provides useful guidelines for rational design of novel materials for organic photovoltaics. The bulkiness of the solubilizing alkyl side chains influences strongly optoelectronic and photovoltaic properties of conjugated polymers. A clear relationship is revealed between the parameters of the photovoltaic cells and the structure of the solubilizing alkyl groups.
ISSN:1022-1352
1521-3935
DOI:10.1002/macp.201700055