Thermochromism in Langmuir-Blodgett films of polyalkylthiophenes

Markus Ahlskog; Jari Paloheimo; Eero Punkka; Henrik Stubb

doi:10.1016/0379-6779(93)90521-W

Thermochromism in Langmuir-Blodgett films of polyalkylthiophenes

Markus Ahlskog, Jari Paloheimo, Eero Punkka, Henrik Stubb

VTT Technical Research Centre of Finland

Research output: Contribution to journal › Article

9 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	3830 - 3835
Number of pages	6
Journal	Synthetic Metals
Volume	57
Issue number	1
DOIs	https://doi.org/10.1016/0379-6779(93)90521-W
Publication status	Published - 1993
MoE publication type	A1 Journal article-refereed

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Ahlskog, M., Paloheimo, J., Punkka, E., & Stubb, H. (1993). Thermochromism in Langmuir-Blodgett films of polyalkylthiophenes. Synthetic Metals, 57(1), 3830 - 3835. https://doi.org/10.1016/0379-6779(93)90521-W

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AU - Punkka, Eero

AU - Stubb, Henrik

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N2 - 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.

AB - 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.

U2 - 10.1016/0379-6779(93)90521-W

DO - 10.1016/0379-6779(93)90521-W

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10.1016/0379-6779(93)90521-W