1. New cyclopentadithiophene-based (X-DAD′AD)n conjugated polymers for organic solar cells.
- Author
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Akkuratov, Alexander, Prudnov, Fedor, Mukhacheva, Olga, Luchkin, Sergey, Sagdullina, Diana, Obrezkov, Filipp, Kuznetsov, Petr, Volyniuk, Dmytro, Grazulevichus, Juozas V., and Troshin, Pavel
- Subjects
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THIOPHENES , *CONJUGATED polymers , *SOLAR cells , *CARBAZOLE , *HETEROJUNCTIONS - Abstract
Abstract Five new donor-acceptor (X-DAD'AD) n type conjugated polymers have been synthesized using different X blocks based on carbazole, fluorene, silafluorene, benzodithiophene, and cyclopentadithiophene (CPDT). The strongly electron donating CPDT unit was used as a central D′ fragment to enhance intramolecular charge transfer interactions along the polymer backbone and reduce the bandgap of the resulting conjugated polymers. Apparently, the nature of the X block impacts the photophysical, morphological and optoelectronic properties of the designed polymers as well as their performance in bulk heterojunction solar cells. Fluorene-based copolymer P2 in combination with [70]PCBM delivered the best power conversion efficiency of 5.0% with a V OC of 0.78 V, a J SC of 11.1 mA/cm2 and a FF of 57%. Possibility for easy variation of the X and D′ blocks in the designed materials paves a way towards design of a variety of new materials for optoelectronic applications. Graphical abstract The proposed design strategy using a combination of two electron donor moieties (D and D′) with benzothiadiazole acceptor (A) units and different X blocks delivered a set of five new (X-DAD'AD) n conjugated polymers. The nature of the X block impacted the optoelectronic properties of the designed polymers as well as their performance in bulk heterojunction solar cells. fx1 Highlights • Novel (-X-DAD'AD) n type cyclopentadithiophene-based copolymers were synthesized. • Variation of X block strongly influences the optoelectronic properties of polymers. • Designed polymers delivered photovoltaic performances of 1.6–5.0% in solar cells. • The polymer structure strongly influences the V OC of the solar cells. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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