Influence of p-GaN/Ni/Au ohmic contact characteristics by Zn~+ implantation
base ohmic contact
Study of the improvement of Ni/Au ohmic contact to p-GaN by Pt~+ implantation
If using a separate current source and voltmeter to make low resistance measurements, each instrument must be checked for non-ohmic contacts.
To reduce error due to voltmeter non-ohmic contacts, use shielding and appropriate grounding to reduce ac pickup.