In our work we have studied gold contacts electrolessly deposited on (CdZn)Te surface from methanol and water-based solutions. We have observed strong injection properties at voltages higher than 100 V that disappears when using contacts on lateral sides instead of bottom ones.
In our opinion this phenomenon depends on crystallographic orientation of contact surfaces. Also after additional surface treatment and applying guard ring we have obtained sample with bulk specific resistivity of 1E11 Ohm*cm.
Alcohol-based contacts showed slightly better mechanical (adhesion and uniformity) and very similar electrical (I-V curves) properties in compliance with water-based ones.