Abstract
Boron phosphide(BP)films were grown on Si and sapphire substrates by thermal decomposition of a B2H6-PH3 mixture in hydrogen at high temperature. The crystal quality and electrical properties of the BP films were studied. The conductivity type of BP on Si was almost n-type, but that BP on sapphire was p-type. Therefore, it is considered that Si doping during the growth act as donors in BP film.