Polymers with benzodithiophene and a series of electron acceptors: Comparison of direct arylation polymerization and Stille cross-coupling for device performance

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2018-08-19

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Göker, Seza
Bura, Thomas
Hizalan, Gonul
Toppare, Levent Kamil
Leclerc, Mario

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In recent years, increasing demand for sustainable clean energy leads scientists to elaborate on organic photovoltaics. Bulk-heterojunction (BHJ) solar cells provide several advantages such as low cost, low weight, flexibility, and large-area manufacturing ability and the ease of material processing.1 To reduce the fabrication cost of photovoltaic devices, the development of materials as active layers for such devices are important. Direct arylation (DHAP) is an ecologically benign alternative to the conventional cross-coupling reactions without any requirement of organometallic intermediates hence synthetic steps, metallic by-products where the cost is reduced.2 For the first time, Allard and coworkers synthesized thieno[3,4- d]thiazole-based (TTz) alternating copolymers synthesized via Stille, Suzuki or DHAP methods. The polymers which were synthesized via conventional Stille cross coupling and DHAP revealed a comparable molecular weight (Mn) of ca. 32 kDa, demonstrating that direct arylation is a possible method to obtain Mn as high as those achieved by conventional coupling reactions.3 Benzo[1,2-b:4,5-b′]dithiophene (BDT) as the electron donor provides polymers to have promising photovoltaic properties due to its planar conjugated structure, regioregularity, easy modification and high hole mobility. In this work, benzodithiophene was used together with a series of different electron acceptors like isoindigo and benzazole to synthesize high molecular weight polymers with minimum structural defects. Polymers were synthesized via Stille cross coupling and DHAP to be used as active layers for organic solar cells.

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https://hdl.handle.net/11511/54006

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Department of Chemistry, Conference / Seminar

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Citation Formats

S. Göker, T. Bura, G. Hizalan, L. K. Toppare, and M. Leclerc, “Polymers with benzodithiophene and a series of electron acceptors: Comparison of direct arylation polymerization and Stille cross-coupling for device performance,” 2018, vol. 256, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/54006.