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Magnetical and electrical tuning of transient photovoltaic effects in manganite-based heterojunctions

Hao Ni, Zengji Yue, Kun Zhao, Wenfeng Xiang, Songqing Zhao, Aijun Wang, Yu-Chau Kong, and Hong-Kuen Wong

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Abstract

Magnetically and bias current tunable transient photovoltaic (TPV) responses have been investigated in a manganite-based heterojunction composed of a La2/3Ca1/3MnO3 film and an n-type Si substrate at ambient temperature. Under irradiation of 248 nm pulsed laser with 20 ns duration the TPV peak values can be modulated in a range of −125 to 138 mV when the applied magnetic field perpendicular to the interface changes from −6.4 to + 6.4 kOe, and the relative variations (TPVH – TPV0)/TPV0 reach up to about 1000%. In addition, TPV responses can be also affected by bias current, and the photoresponse peaks change from positive to negative with the currents from −350 to 350 μA. These results indicate that the manganite-based heterojunction can be used for magnetically and electrically tunable ultraviolet photodetectors.

©2012 Optical Society of America

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Figures (5)
Fig. 1
Fig. 1 A typical I-V curve with the strong asymmetry at room temperature measured by the four-point method with two electrodes on LCMO (electrode separation about 2 mm) and the other two on Si. The inset shows the schematic diagram of experiments.

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Fig. 2
Fig. 2 (a) TPV under pulsed laser illumination in selected H (0, −6.4 and 6.4 kOe) with electrode setting at LCMO and Si. Fitting curves result from (TPV6.4 + TPV-6.4)/2 which agrees with TPV0. The on sample energy density is 0.61 mJ/mm2. (b) TPV variation defined as ΔTPVH/TPV0 = (TPVH – TPV0)/TPV0. Inset shows the schematic diagram of experimental set up.

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Fig. 3
Fig. 3 TPVP as a function of selected H. The on sample energy density is 0.61 mJ/mm2. The inset shows the dependence of the modulation coefficient Δλ on the external magnetic fields.

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Fig. 4
Fig. 4 TPV to pulsed laser illumination as a function of external magnetic field 6.4, 0, −6.4 kOe and bias current −350, 0, 350 μA simultaneously. The first extreme value of TPV (Ib, H) occur at t = t1 = 11 ns while that of TPV (Ib, 0) occur at t = t0 = 24 ns. The on sample energy density is 0.16 mJ/mm2.

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Fig. 5
Fig. 5 The three-dimensional graph about the TPVP, bias current Ib and magnetic field H.

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