Table 1.

Work functions of metal materials and GaN semiconductor^31–35.

Materials	Ti	Au	Ni	Pt	V	Al
Work function (eV)	4.33	5.1	5.04	5.12	4.3	4.28
Materials	Cu (Cal.)	Cu (Exp.)	n-GaN	p-GaN
Work function (eV)	(100)~4.84 (110)~4.72 (111)~5.19	(100)~4.59 (110)~4.48 (111)~4.94	4.2	7.5