[电] intrinsic-contact potential diffe-rence

běn zhì jiē chù diàn wèi chà ㄅㄣˇ ㄓˋ ㄐㄧㄝ ㄔㄨˋ ㄉㄧㄢˋ ㄨㄟˋ ㄔㄚˋ