Voltage tunable photodetecting properties of La0.4Ca0.6MnO3 films grown on miscut LaSrAlO4 substrates

Li, X. M.; Zhao, K.; Ni, H.; Zhao, S. Q.; Xiang, W. F.; Lu, Z. Q.; Yue, Z. J.; Wang, F.; Kong, Yu-Chau; Wong, H. K.
July 2010
Applied Physics Letters;7/26/2010, Vol. 97 Issue 4, p044104
Academic Journal
We report the voltage tunable photodetecting properties of a La0.4Ca0.6MnO3 film grown on miscut LaSrAlO4 (001) substrates under ultraviolet pulsed laser irradiation at ambient temperature. The photovoltage and photocurrent peak sensitivities can be tuned in the range of 0.295–0.786 V/mJ and 0.172–0.314 A/mJ, respectively, when the applied bias is changed from -20 to +20 V, indicating that the vicinal manganite film can be used as an electric tunable ultraviolet photodetector. A possible mechanism based on the high resolution transmission electron microscopy is introduced to explain the experiment results.


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