Optical-absorption edge and disorder effects in hydrogenated amorphous diamondlike carbon films

T. Datta, John A. Woollam, W. Notohamiprodjo

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

Optical absorption (15 eV) in rf-deposited hydrogenated (2040 at. %) amorphous diamondlike carbon films has been studied as a function of heat treatment. For E2.5 eV a Tauc behavior is exhibited. Optical band gaps Eg are2.4 eV. At lower energies, band tailing with an Urbach focus is found. E0, the width of the tail, is quantitatively explained in terms of the annealing temperature TH. Increasing TH (<700 K) reduces the hydrogen content, lowers Eg, and appears to harden the films. Eg is determined to be a linear function of E0. Additional analysis was performed in terms of a divergence temperature, T0; the results of this analysis are comparable to those observed in a-Si:H.

Original languageEnglish (US)
Pages (from-to)5956-5960
Number of pages5
JournalPhysical Review B
Volume40
Issue number9
DOIs
StatePublished - Jan 1 1989

Fingerprint

Carbon films
Amorphous carbon
Amorphous films
Light absorption
optical absorption
disorders
carbon
Optical band gaps
Tailings
Band structure
energy bands
Hydrogen
divergence
heat treatment
Heat treatment
Annealing
Temperature
annealing
temperature
hydrogen

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Optical-absorption edge and disorder effects in hydrogenated amorphous diamondlike carbon films. / Datta, T.; Woollam, John A.; Notohamiprodjo, W.

In: Physical Review B, Vol. 40, No. 9, 01.01.1989, p. 5956-5960.

Research output: Contribution to journalArticle

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