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

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• 作者：Anne Neubig ^{anne.neubig@uni-bayreuth.de" class="auth_mail} ; Mukundan Thelakkat ; ^{mukundan.thelakkat@uni-bayreuth.de" class="auth_mail}
• 关键词：Field effect mobility ; Benzothiadiazole ; Donor-acceptor copolymers
• 刊名：Polymer
• 出版年：27 May 2014
• 年：2014
• 卷：55
• 期：11
• 页码：2621-2627
• 全文大小：1115 K

文摘

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 (trong class="boldFont">BTtrong>) as acceptor and 3-Hexylthiophene (trong class="boldFont">Thtrong>) as donor units. Especially, bifunctional AB-type monomers were developed to obtain the desired randomly linked copolymer trong class="boldFont">r-BT-2Th.trong> We chose AA/BB-type monomers as well to obtain relevant alternating copolymers trong class="boldFont">a-BT-2Thtrong> and trong class="boldFont">a-BT-1Thtrong>. The systematic structural variation enables us to compare the copolymers in a precise manner. In dilute solutions trong class="boldFont">r-BT-2Thtrong> and trong class="boldFont">a-BT-2Thtrong> resemble closely in absorption spectra and have similar oxidation potentials regardless of random or alternating arrangement of donor and acceptor. In thin films, trong class="boldFont">a-BT-2Thtrong> shows the lowest optical gap and depicts the highest field effect hole mobility of 1.5 × 10⁻³ cm² V⁻¹ s⁻¹.