Electrode influence on the transport through SrRuO3/Cr-doped SrZrO3/metal junctions

The authors have investigated the charge transport properties across heterostructures built from a SrRuO3 bottom electrode, a Cr-doped SrZrO3 perovskite film, and different top electrode metals (Pt, Cu, Ag, Cr, Mg, and SrRuO3). The resistances of such junctions were dependent on the top metal and ranging between 1 and 1000 k Omega. The observed I-V curves were modeled with the equation I(V)=aV+bV(2), where the variation of a with metal type was related to the work function while the variation of b was related to the oxygen affinity of the metal, consistent with space charge limited conduction through a defected interface. (C) 2007 American Institute of Physics.