Conduction mechanisms in undoped thin films of C60 and C60/70

Jari Paloheimo, Heikki Isotalo, Johann Kastner, Hans Kuzmany

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Abstract

Undoped thin films of C60 and C60/70 mixture have been electrically and optically characterized over a wide temperature range T=10…475 K. In this paper the results of the field-effect conductance, conductivity, thermoelectric power, thermoabsorption and electroabsorption measurements will be presented. The transittor studies gave an n-type behaviour, and the thermally activated field-effect conductance obeyed the Meyer-Neldel rule. The conductivity showed an activated temperature dependence above 250 K, too, but turned into a nonactivated dependence below 200 K. The results may be explained by assuming a distribution of gap states. Furthermore, we have deposited and characterized Langmuir-Blodgett films of C60/70 and its heterostructures with poly(3-hexylthiophene).

Original languageEnglish
Pages (from-to)3185 - 3190
Number of pages6
JournalSynthetic Metals
Volume56
Issue number2-3
DOIs
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed

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Paloheimo, J., Isotalo, H., Kastner, J., & Kuzmany, H. (1993). Conduction mechanisms in undoped thin films of C60 and C60/70. Synthetic Metals, 56(2-3), 3185 - 3190. https://doi.org/10.1016/0379-6779(93)90100-B