The implication of Meyer-Neldel behaviour for oxidising gas detection in phthalocyanine thin-films

作者: D. M. Goldie

DOI: 10.1023/A:1016103605250

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摘要: The dark conductivity of phthalocyanine thin-films are often sensitive to the presence oxidising gases such that changes in magnitude accompanied by shifts associated thermal activation energy for conduction. It is noted pre-factor and invariably related Meyer-Neldel rule so becomes independent gas concentration at a finite temperature T0. Data illustrating relationship presented evaporated metal-free phthtalocyanine films containing various amounts absorbed oxygen where T0 estimated be about 1161 K. Independent work has proposed may energetic width localised band tail states exponentially distributed it therefore argued particular will dictate its potential application as gas-sensing medium. Phthalocyanines exhibit low thus offer threshold detection possibilities expense response speed, whereas high materials should considered situations demanding rapid concentrations gases.

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