ULTRAVIOLET REFLECTANCE OF AIN, DIAMOND-LIKE CARBON, AND SIC THIN-FILMS

The vacuum ultraviolet (VUV) (120-200 nm) and extreme ultraviolet (EUV) (80-120 nm) reflectance characteristics of as-deposited films of amorphous aluminum nitride (AlN) and diamond-like carbon (DLC), and of single-crystal β-silicon carbide (SiC) have been measured. AlN and DLC films have been grown by plasma-enhanced chemical vapor deposition (PECVD) and the SiC film by chemical vapor deposition (CVD). The VUV reflectivities of AlN and SiC exceed 50% while the reflectance of DLC film is low (∼10%). Furthermore, DLC and SiC films display EUV reflectance characteristics that are very desirable. The reflectivity of as-deposited SiC is 40% and that of DLC is about 20%.