EFFECT OF HELIUM GAS ON THE DEPOSITION OF DIAMOND LIKE CARBON THIN FILMS BY PULSED LASER ABLATION

Abstract

We have studied the effects of ambient Helium gas pressure on the optical, structural and physical properties of the diamond like carbon thin films using a camphoric carbon (CC) soot target, deposited by pulsed laser ablation. Both the optical gap and electrical resistivity are found to increase with 2.6 Torr leads to a decre ase in optical gap and electrical resistivity. The films are further investigated by different spectroscopic techniques such as, Raman, XPS and FTIR spectroscopy, and surface morphological techniques like SEM and AFM. Improvement of the opto-electrical and structural properties of the diamondlike carbonaceous films deposited in helium environment using CC soot target reveal different behaviour than reported earlier.