Random vs. alternating donor-acceptor copolymers : a comparative study of absorption and field effect mobility

Title data

Neubig, Anne ; Thelakkat, Mukundan:
Random vs. alternating donor-acceptor copolymers : a comparative study of absorption and field effect mobility.
In: Polymer. Vol. 55 (2014) Issue 11 . - pp. 2621-2627.
ISSN 0032-3861
DOI: https://doi.org/10.1016/j.polymer.2014.04.004

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Abstract in another language

The influence of the arrangement of donor and acceptor units in a conjugated copolymer chain on the absorption and field effect mobilities was studied. We synthesized a target random copolymer and compared it with two structurally relevant alternating copolymers, all consisting of 2,1,3-Benzothiadiazole (BT) as acceptor and 3-Hexylthiophene (Th) as donor units. Especially, bifunctional AB-type monomers were developed to obtain the desired randomly linked copolymer r-BT-2Th. We chose AA/BB-type monomers as well to obtain relevant alternating copolymers a-BT-2Th and a-BT-1Th. The systematic structural variation enables us to compare the copolymers in a precise manner. In dilute solutions r-BT-2Th and a-BT-2Th resemble closely in absorption spectra and have similar oxidation potentials regardless of random or alternating arrangement of donor and acceptor. In thin films, a-BT-2Th shows the lowest optical gap and depicts the highest field effect hole mobility of 1.5 × 10−3 cm2 V−1 s−1.