Sm. Mominuzzaman et al., Phosphorus doping and defect studies of diamnond-like carbon films by pulsed laser deposition using camphoric carbon target, DIAM RELAT, 10(3-7), 2001, pp. 984-988
Phosphorous is doped in diamond-like carbon (DLC) films by pulsed (XeCl) la
ser deposition technique using a camphoric carbon (CC) target, obtained fro
m burning camphor (C10H16O), a natural source. The activation energy of und
oped film is approximately 0.17 eV and increased to approximately 0.23 eV f
or the film deposited from the target containing 1% P. With a further incre
ase of P content, the activation energy decreases to approximately 0.12 eV
for the film deposited from the target containing 7% P. Study of activation
energy reveals that the Fermi level of the carbon film moves from the vale
nce band edge to near the conduction band edge through the mid-gap. The Tau
c gap, conductivity, activation energy together with electron spin resonanc
e (ESR) spectroscopic studies reveal successful doping of P in the films de
posited from target containing up to 5% P upon modifications in the gap sta
tes. (C) 2001 Elsevier Science B.V. All rights reserved.