Ultrathin undoped tetrahedral amorphous carbon films: thickness dependence of the electronic structure and implications for their electrochemical behaviour

By Protopopova, V. S.; Wester, N.; Caro, M. A.; Gabdullin, P. G.; Palomaki, T.; Laurila, T. & Koskinen, J.
Published in Phys. Chem. Chem. Phys. The Royal Society of Chemistry 2015

Abstract

In this paper we show that the electronic properties of ultrathin tetrahedral amorphous carbon (ta-C) films are heavily dependent on their thickness. By using scanning tunnelling spectroscopy, Raman spectroscopy, and conductive atomic force microscopy, it was found that a decrease of ta-C thickness from 30 to 7 nm leads to (i) the narrowing of the band gap; (ii) appearance of shallower monoenergetic traps as well as the increase of their concentration; (iii) the increase of the equilibri

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