Influence of Alkyl Side Chain Lengths on Electrical and Thermoelectric Properties of Diketopyrrolopyrrole-Based Polymers
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초록
내용
Recently, emerging interest in organic thermoelectric (OTE) materials has inspired a great focus on developing the conjugated polymers (CPs) to obtain high TE performance. Despite recent advances in high performance OTE materials, many challenges still remain to be overcome. Especially, the low electrical conductivities and power factors of CPs should be further improved for practical application of OTE. Hence, structural designs of CPs and their effects on TE performance should be in-depth understood. In this study, we synthesized the selenium-substituted diketopyrrolopyrrole (DPPse) polymers with three different side chain lengths (hexyldecyl (HD), octadecyl (OD), and decyltetra (DT)) to investigate their effects on electrical and thermoelectric properties. Although the three different alkyl side chains of the DPPSe polymers showed the negligible influence on the Seebeck coefficients, the DPPSe-DT exhibited the higher electrical conductivity than those of DPPSe-OD and DPPSe-HD. As a result, the AuCl3 doped DPPSe-DT showed high electric conductivity of 98 S cm-1 and power factor of 216 μW m-1K-2.