Laser-induced gold deposition on p+-Si from liquid precursors: a study on the reduction of gold ions through competing Dember and Seebeck effects.
Gold micropatterns are deposited from aqueous solutions of NaAuCl(4) on boron-doped Si(100) surfaces (rho = 1.5 x 10(-4) Omega m) using a focused Ar(+) laser beam (TEM(00), lambda = 488 nm, w(0) = 1.5 mum, P = 20-80 mW). The finite-element method employed for computing the surface temperature profiles reveals that the maximum temperature at the precursor/silicon interface increases only to the range 316-372 K, which is not high enough for chemical reactions with formaldehyde in the precursor. This suggests a different mechanism to be responsible for the reduction of gold ions, namely, changes in the surface potential of Si caused by the Dember and Seebeck effects.
Tóth
Géza
G
Microelectronics and Materials Physics Laboratories, University of Oulu, P.O. Box 4500, FIN-90570, Oulu, Finland.
Kordás
Krisztián
K
Vähäkangas
Jouko
J
Uusimäki
Antti
A
George
Thomas F
TF
Nanai
Laszló
L