Photoconductivity and electrical properties of diamond films grown by MPCVD

Pereira, L.; Pereira, E.; Gomes, Henrique L.

http://hdl.handle.net/10400.1/6641

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Authors

Pereira, L.

Pereira, E.

Gomes, Henrique L.

Abstract(s)

The electrical and photoconductive features of as-grown microwave-plasma-assisted chemical-vapour deposition (MPCVD) diamond films are studied in correlation with magnetic results obtained from electron paramagnetic resonance (EPR). Also, the morphology is analysed by atomic force microscopy (AFM) showing [111] crystals with a good uniformity of the deposit. The photoresponse as well the current-voltage features observed show an efficient photogeneration of carriers while the optoelectronic characteristics of the metal-diamond junction have an ideality factor of 1.6 together with a rectification ratio of about 10(4) at +/-2.5 V. The nature of the mechanisms responsible for the conduction is discussed. (C) 1998 Elsevier Science S.A.