We have studied the diamond-like carbon (DLC) and carbon nitride (CN) thin films deposited by KrF excimer laser (248 nm) ablation under various ambient gas conditions. DLC thin films were deposited on quartz and Si(100) substrates in pure hydrogen and helium gas at laser fluence of 2-10 J/cm2. Optical absorption measurements show that the DLC films prepared in a H2 atmosphere of 800 mTorr with 8 J/cm2 have an optical band gap of 2.0 eV. The tetrahedral amorphous carbon (ta-C) films deposited in helium gas have an optical band gap of approximately 1.0 eV. Incorporation of nitrogen atoms in the DLC films showed marked change in the optical properties when the N2 mixture ratio in hydrogen exceeded 50%. The composite layered structures consisting of DLC and CN were formed to investigate the optical property in stacked CN films. Laser-induced fluorescent technique was used to study the dynamics of C2 molecules produced by pulsed laser deposition at various ambient gas conditions.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Mechanical Engineering
- Materials Chemistry
- Electrical and Electronic Engineering