H. Sik et al., (NH4)2SX PASSIVATION TREATMENT AND UVCVD STABILIZATION FOR GAINP GAASHETEROJUNCTION BIPOLAR-TRANSISTORS/, Microelectronic engineering, 25(2-4), 1994, pp. 293-298
It has been demonstrated that sulfur treatment using (NH4)2Sx solution
provides an effective passivation of the GaAs surface. The effectiven
ess of the treatment is dependant on polysulfides S(n)2- concentration
s. These treatments being unfortunately not stable with the time, a st
abilisation process using a dielectric film overcoathas been investiga
ted; a silicon nitride film deposited by the UVCVD technique has been
chosen.