Heavily P-Doped (>1021 cm-3) Silicon Films Grown by Photochemical Vapor Deposition at a Very Low Temperature of 250°C

Abstract
Heavily phosphorus-doped epitaxial silicon films have been successfully grown by a novel photochemical vapor deposition process at a very low temperature of 250°C. The epitaxial layers were deposited from SiH4-SiH2F2-PH3 gases diluted with H2 on single-crystal silicon substrates. The highest electron concentration of 2.3×1021 cm-3 was obtained at a doping quantity (PH3/SiH4) of 4.2%. From the dependence of resistivity on the sample temperatures, it was found that the obtained samples were “metallic”.
Keywords