Rectifying and photovoltaic properties of the heterojunction composed of CaMnO3 and Nb-doped SrTiO3

Sun, J. R.; Zhang, S. Y.; Shen, B. G.; Wong, H. K.
January 2005
Applied Physics Letters;1/31/2005, Vol. 86 Issue 5, p053503
Academic Journal
A heterojunction composed of CaMnO3 (CMO) and Nb-doped SrTiO3 (STON) was fabricated and its properties were studied and compared with La0.67Ca0.33MnO3/STON and LaMnO3+δ/STON p-n, junctions. This CMO/STON junction exhibits an asymmetric current–voltage relation similar to a p-n junction. The most remarkable discovery is that the magnetic state of the manganites has a strong impact on the rectifying behaviors. The diffusion voltage, which is the critical voltage for the current rush, shows a tendency to decrease/increase with the establishment of the antiferromagnetic/ferromagnetic order in the manganites of the junction. Similar to other manganite p-n junctions, CMO/STON also exhibits a significant photovoltaic effect, and the maximum photovoltage is ∼2.2 mV under the illumination of ∼7 mW light (λ=460 nm). A qualitative explanation is given based on an analysis on the band diagram of the junctions.


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