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RESEARCH ARTICLE
Contents Vol 68(11)

Tuning the Light Absorption of Donor–Acceptor Conjugated Polymers: Effects of Side Chains and ‘Spacer’ Units in Thieno[3,4-b]pyrazine-Fluorene Copolymers

Michael E. Mulholland A , Kristine L. Konkol A , Trent E. Anderson A , Ryan L. Schwiderski A and Seth C. Rasmussen A B
+ Author Affiliations
- Author Affiliations

A Department of Chemistry and Biochemistry, North Dakota State University, NDSU Department 2735, PO Box 6050, Fargo, ND 58108-6050, USA.

B Corresponding author. Email: seth.rasmussen@ndsu.edu

Australian Journal of Chemistry 68(11) 1759-1766 https://doi.org/10.1071/CH15241
Submitted: 2 May 2015  Accepted: 22 June 2015   Published: 21 July 2015

Abstract

Four donor–acceptor (D-A) copolymers of 2,3-difunctionalized thieno[3,4-b]pyrazine (TP) and 9,9-dioctylfluorene were prepared in order to illustrate the ability to tune the electronic and optical properties of TP-based D-A polymers by the choice of side chains on the TP unit. In addition, analogous polymers were prepared with and without thiophene spacer units in order to allow discussion of their effect on the material properties. This combination of effects allowed tuning of the band gap over the range of 1.6–2.1 eV. Full optical and electrochemical characterization is reported for all materials, as well as initial photovoltaic device data for representative materials.


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