Synthesis and characterization of donor-acceptor copolymers carrying triphenylamine units for photovoltaic applications

Katharina Neumann; Mukundan Thelakkat

doi:10.1117/12.929842

13 September 2012 Synthesis and characterization of donor-acceptor copolymers carrying triphenylamine units for photovoltaic applications

Katharina Neumann, Mukundan Thelakkat

Author Affiliations +

Proceedings Volume 8477, Organic Photovoltaics XIII; 84771H (2012) https://doi.org/10.1117/12.929842
Event: SPIE Organic Photonics + Electronics, 2012, San Diego, California, United States

Abstract

The synthesis and analysis of solution processable polymers for organic solar cells is crucial for innovative solar cell technologies such as printing processes. In the field of donor materials for photovoltaic applications, polymers based on tetraphenylamine (TPA) are well known hole conducting materials. Here, we synthesized two conjugated TPA containing copolymers via Suzuki polycondensation. We investigated the tuning of the energy levels of the TPA based polymers by two different concepts. Firstly, we introduced an acceptor unit in the side chain. The main-chain of this copolymer was built from TPA units. The resulting copolymer 2-(4-((4'-((4-(2-ethylhexyloxy)phenyl)(paratolyl) amino)biphenyl-4-yl)(para-tolyl)amino)benzylidene) malononitrile P1 showed a broader absorption up to 550 nm. Secondly, we used a donor-acceptor concept by synthesizing a copolymer with alternating electron donating TPA and electron withdrawing Thieno[3,4-b]thiophene ester units. Consequently, the absorption maximum in the copolymer octyl-6-(4-((4-(2-ethylhexyloxy)phenyl)(p-tolyl)amino)phenyl)-4-methylthieno[3,4-b]thiophene-2-carboxylate P2 was red shifted to 580 nm. All three polymers showed high thermal stability. By UV-vis and Cyclic voltammetry measurements the optical and electrochemical properties of the polymers were analyzed.

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Katharina Neumann and Mukundan Thelakkat "Synthesis and characterization of donor-acceptor copolymers carrying triphenylamine units for photovoltaic applications", Proc. SPIE 8477, Organic Photovoltaics XIII, 84771H (13 September 2012); https://doi.org/10.1117/12.929842

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KEYWORDS

Polymers

Solar cells

Photovoltaics

Absorption

Organic photovoltaics

Telescopic pixel displays

UV optics

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