LASER INDUCED DIRECT WRITING OF ALUMINIUM

Maskless configuration of aluminium has been grown by using visible light of a copper laser for pyrolytic decomposition of trimethylaluminium (TMA). The process was carried out in vacuum or argon and hydrogen atmosphere at partial pressure of TMA 0,5 and 5 mbar. The crystalline structure of the coating shows well defined grains. This morphology was observed for the first time by using pulsed visible laser. The Auger electron spectra indicate the presence of bonded oxygen and carbon incorporated into the aluminium. These elements cannot be totally avoided but their concentration can be reduced at the established optimum conditions to obtain low resistivity of the layer