Thermochromism in Langmuir-Blodgett films of polyalkylthiophenes

Markus Ahlskog, Jari Paloheimo, Eero Punkka, Henrik Stubb

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Thermochromic effects in Langmuir-Blodgett (LB) films of poly(3-alkylthiophenes) mixed with arachidic acid have been studied above room temperature. The temperature-dependent optical absorption, conductivity and time constants associated with them were investigated. The absorption maximum of undoped films shifted to larger energies with increasing temperature. In complementary measurements of spin-coated thin films the shift was observed to occur at a higher temperature than in the LB films. The changes in the optical absorption and the conductivity were only partly reversible and, in addition, time-dependent. The thermal dedoping of doped LB films was also studied.

Original languageEnglish
Pages (from-to)3830 - 3835
Number of pages6
JournalSynthetic Metals
Issue number1
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed


Cite this

Ahlskog, M., Paloheimo, J., Punkka, E., & Stubb, H. (1993). Thermochromism in Langmuir-Blodgett films of polyalkylthiophenes. Synthetic Metals, 57(1), 3830 - 3835.