The sensor (10) has main portion (20) having passivation layer (30) and control electrode (100). A contact area has a first contact region having a formation (112) passing through passivation layer and having a bottom surface with conductive layer. The first contact region has frictional and electrical connections with control electrode via connecting component (130). The second contact region has frictional connection with control electrode via connecting component (140). The connecting component (130) at least partially fills the formation and connects electrode to conductive layer.
