Patent ID: 8105468

Claim:
A method for forming a tantalum nitride film comprising the steps of: introducing a raw gas consisting of a coordination compound constituted by an elemental tantalum (Ta) having a coordinated ligand represented by the general formula: N═(R, R′) (in the formula, R and R′ may be the same or different and each represents an alkyl group having 1 to 6 carbon atoms), and NH 3 gas or NH x radicals into a vacuum chamber; adsorbing the raw gas and NH 3 gas or NH x radicals on a substrate for the reduction of the raw compound on the substrate to form a surface adsorption film having a thickness corresponding to one or several atoms, which consists of the resulting reduced compound, and to partially remove the R(R′) groups bonded to the N atoms present in the coordination compounds through the cleavage thereof; reacting the surface adsorption film containing the reduced compound with H radicals derived from an H atom-containing gas to break the Ta—N bonds and to break and remove the remaining R(R′) groups bonded to the N atoms in the foregoing reduced compound; and alternately repeating the adsorption step and the reaction step to form a tantalum nitride film rich in tantalum atoms.