Temperature dependence on rectifying and photoelectronic properties of La0.67Sr0.33MnO3/Nb∶SrTiO3 (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.