Abundant photoelectronic behaviors of La_(0.67)Sr_(0.33)MnO_3/Nb:SrTiO_3 junctions |
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Affiliation: | 1.Department of Applied Physics, Wuhan University of Science and Technology, Wuhan 430081, China;2.Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;3.Department of Physics, Beijing Normal University, Beijing 100875, China |
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Abstract: | Temperature dependence on rectifying and photoelectronic properties of La_(0.67)Sr_(0.33)MnO_3/Nb:SrTiO_3(LSMO/STON) junctions with the thickness values of LSMO film varying from 1 nm to 54 nm are systematically studied. As shown experimentally, the junctions exhibit good rectifying properties. The significant differences in photoemission property among the LSMO/STON junctions are observed. For the junction in a thicker LSMO film, the photocurrent shows a monotonic growth when temperature decreases from 300 K to 13 K. While for the junction in an ultrathin LSMO film, the behaviors of photocurrent are more complicated. The photocurrent increases rapidly to a maximum and then smoothly decreases with the decrease of temperature. The unusual phenomenon can be elucidated by the diffusion and recombination model of the photocarrier. |
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Keywords: | manganite heterojunction photocurrent |
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