| http://www.w3.org/ns/prov#value | - The screen printed Al (which may be an Al alloy, such as Ag:Al, or may be substantially Al), is applied to the patterned portion of diffusion barrier 90 removed by the resist and etch step, as shown in FIG. 4M. Thus on firing the Al-based metallization makes direct contact with silicon 12, as shown in FIG. 4N, with the Al forming a p+ layer thereunder (not shown).
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