Abstract
A manganite p–n heterojunction composed of La0.67Sr0.33MnO3 film and 0.05 wt% Nb-doped SrTiO3 substrate is fabricated. Rectifying behavior of the junction well described by the Shockley equation is observed, and the transport properties of the interface are experimentally studied. A satisfactorily logarithmic linear dependence of resistance on temperature is observed in a temperature range of 150 K–380 K, and the linear relation between bias and activation energies deduced from the R−1/T curves is observed. According to activation energy, the interfacial barrier of the heterojunction is obtained, which is 0.91 eV.
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