Temperature-dependent photovoltaic effects in the manganite-based heterojunction

Temperature-dependent photovoltaic effects in the manganite-based heterojunction
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亚锰酸盐基异质结中温度依赖性光伏效应

DOI:
10.1063/1.1806560
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发表时间:
2004-10
期刊:
Appl Phys.Lett.
影响因子:
--
通讯作者:
Y. P. Sun et al
Y. P. Sun et al
中科院分区:
其他
文献类型:
--
作者:
J. R. Sun;Y. P. Sun et al

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在由La0.32Pr0.35Ca0.33MnO3(LPCM)薄膜和0.5wt%Nb掺杂的SrTiO3衬底组成的异质结中观察到强烈的温度依赖光伏效应。光电压随温度的降低而单调增加,当温度从室温降至17K时,在20mW(波长=632nm)的光强下,光电压的相对变化可达7000%。光电压和LPCM磁化强度的同步变化表明了光伏效应温度依赖性的磁性来源。温度对LPCM的光伏效应的影响主要是通过改变LPCM的磁序,进而改变其能带结构。在强光照射下,光伏效应增强,这可能是由于光照引起的能带结构的变化。
Strong temperature-dependent photovoltaic effects have been observed in the heterojunction composed of a La0.32Pr0.35Ca0.33MnO3 (LPCM) film and a 0.5 wt % Nb-doped SrTiO3 substrate. The photovoltage shows a monotonic increase with the decrease of temperature, and its relative change can be as large as ∼7000% for a modest light intensity of 20 mW (wavelength=632nm) when cooled from room temperature down to 17 K. The synchronous variation of photovoltage and the magnetization of LPCM indicates the magnetic origin of the temperature dependence of the photovoltaic effect. It is suggested that the temperature affects the photovoltaic effect by modifying the magnetic order, then the band structure of LPCM. An enhancement of the photovoltaic effect under strong light illumination is also observed, which is probably a result of illumination-induced change of the band structure of LPCM.
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