Method of depositing thin group iiia metal films

PCT No. PCT/GB94/01654 Sec. 371 Date Aug. 22, 1996 Sec. 102(e) Date Aug. 22, 1996 PCT Filed Jul. 29, 1994 PCT Pub. No. WO95/04168 PCT Pub. Date Feb. 9, 1995A method of depositing a Group IIIA metal layer of high purity on a substrate comprises pyrolyzing contacting the substrate with a tritertiary butyl compound of the Group IIIA metal and pyrolyzing the compound to leave the Group IIIA metal deposited on the substrate. The method of the invention may be used on any suitable substrate, such as silicon or polyimide. The method of the invention may be used for the growth of Group IIIA/silicon alloys as well as for depositing semi-conducting III-V alloys such as, for example, AlGaAs, AlInAs and AlSb.