Optical Spectra and Conductivities of Thin Films of the Electride K+(cryptand[2.2.2])e

Autor:	Richard C. Phillips and, William P. Pratt, James Erik Hendrickson† and, James L. Dye
Rok vydání:	1998
Předmět:	Materials science Annealing (metallurgy) Cryptand Analytical chemistry Activation energy Conductivity Surfaces Coatings and Films chemistry.chemical_compound chemistry Materials Chemistry Electride Electrical measurements Crystallite Physical and Theoretical Chemistry Thin film
Zdroj:	The Journal of Physical Chemistry B. 102:3917-3926
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp980564d
Popis:	Optical and electrical measurements on vapor co-deposited thin films of the most conducting electride, K+(cryptand[2.2.2])e-, show results similar to those obtained with polycrystalline pellets and with thin films prepared by solvent evaporation. Initial optical absorbance spectra of films deposited below −50 °C showed contributions from several species, but these spectra evolved with time (annealed) at low temperatures to yield mostly plasmalike spectra, characteristic of marginal metals. Most films deposited at −40 °C showed no change in shape with time, indicating that annealing had occurred during deposition. Four-probe conductivity measurements showed activated temperature dependence with an activation energy of about 0.03 eV, while two-probe conductivity measurements showed similar activation energies, but with a variable resistive barrier at the sample−electrode interfaces. The correlation between conductivities and the decay of the absorbance spectra during decomposition was investigated. Thermal ...
Databáze:	OpenAIRE
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