Responsivity–Resistance Relationship in MIIM Diodes

The metal–insulator–insulator–metal (MIIM) systems of Co/Co 3 O 4 /TiO 2 /Ti and Ni/NiO/TiO 2 /Cr exhibit among the best reported combinations of the desirable quantities of high responsivity and low resistance. The relationship between responsivity and resistance in MIIM diodes is developed by fabricating and measuring hundreds of diodes of these compositions. For both diodes, higher responsivities are associated with higher resistances, which confirms a theoretical prediction for MIIM diode characteristics. Simulation of diode behavior using a transfer-matrix method diode simulator confirms the results and is consistent with nonresonant tunneling behavior.