Temperature Study of the Polarized Reflectivity of TEA(TCNQ)2 Single Crystal

I. Olejniczak and A. Graja Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17/19, 60-179 Poznań, Poland

Received: February 16, 1993

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The infrared reflection spectra of the organic quasi-one-dimensional semiconductor triethylammonium (TCNQ)2 between 80 and 300 K are reported. Characteristic changes in the temperature dependencies of the bands assigned to the donor vibrations are observed. An interpretation of the electron-molecular vibration coupling in terms of the dimer theory is discussed. It is concluded that the thermal evolution of the spectrum corroborates the semiconductor-semiconductor type of phase transition attributed to the cation disorder.

DOI: 10.12693/APhysPolA.83.517 PACS numbers: 78.30.Jw, 33.10.Lb, 33.20.Ea, 33.90.+h