TY - JOUR
T1 - Optical-absorption edge and disorder effects in hydrogenated amorphous diamondlike carbon films
AU - Datta, T.
AU - Woollam, John A.
AU - Notohamiprodjo, W.
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1989
Y1 - 1989
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.40.5956
DO - 10.1103/PhysRevB.40.5956
M3 - Article
AN - SCOPUS:0000021091
VL - 40
SP - 5956
EP - 5960
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 9
ER -