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首页> 外文期刊>IEEE Transactions on Magnetics >Photovoltaic Property of Multiferroic ${hbox{BiFeO}}_3$ Films With Different Textures on Glass Substrates
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Photovoltaic Property of Multiferroic ${hbox{BiFeO}}_3$ Films With Different Textures on Glass Substrates

机译：在玻璃基板上具有不同纹理的多铁性$ {hbox {BiFeO}} _ 3 $薄膜的光伏性能

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摘要

The photovoltaic (PV) property of multiferroic ${hbox{BiFeO}}_3$ (BFO) nanocrystalline films with different textures on glass substrates has been studied. Highly textured BFO(001) films were obtained on ferromagnetic $L{1_0}$-FePt(001) bottom electrodes by sputtering, while the isotropic polycrystalline BFO films were prepared on 20-nm-thick Pt(111) bottom electrodes by pulse laser deposition. All studied BFO films exhibited significant PV effect under laser illumination with wavelength of 405 nm, and the short-circuit photocurrent density was increased with the increase of laser intensity. Large photocurrent density ( ${J_{rm sc}}$) of $5.9~muhbox{A}/{hbox{cm}}^2$ at laser power of $220~hbox{mW}/{hbox{cm}}^2$ was obtained in the BFO(001) film grown on 20-nm-thick FePt electrode, and the value was larger than that of the isotropic single phase BFO film by a factor more than 1.7. This difference could be explained by the depolarization effect along different lattice orientations. Furthermore, it was found that the larger compressive residual strain in the BFO(001) film leads to a 34% decrement in $J_{rm sc}$ , which was believed to result from the widened band gap. PV property was also sensitive to phase and roughness, the formation of ${hbox{Bi}}_{2}{hbox{O}}_3$, and a roughened surface suppresses PV effect.
机译：研究了在玻璃基板上具有不同纹理的多铁性$ {hbox {BiFeO}} _ 3 $（BFO）纳米晶膜的光伏（PV）性能。通过溅射在铁磁$ L {1_0} $-FePt（001）底部电极上获得高织构化BFO（001）膜，并通过脉冲激光在厚度为20 nm的Pt（111）底部电极上制备各向同性多晶BFO膜沉积。所有研究的BFO薄膜在波长为405 nm的激光照射下均表现出显着的PV效应，并且短路光电流密度随着激光强度的增加而增加。 $ 5.9〜muhbox {A} / {hbox {cm}} ^ 2 $的大光电流密度（$ {J_ {rm sc}} $）在$ 220〜hbox {mW} / {hbox {cm}} ^ 2的激光功率下在生长于20 nm厚的FePt电极上的BFO（001）膜中获得了$，该值比各向同性单相BFO膜的值大1.7倍以上。这种差异可以通过沿着不同晶格取向的去极化效应来解释。此外，发现BFO（001）膜中较大的压缩残余应变导致$ J_ {rm sc} $减小34％，这被认为是由于带隙变宽导致的。 PV特性对相位和粗糙度也很敏感，$ {hbox {Bi}} _ {2} {hbox {O}} _ 3 $的形成以及粗糙的表面会抑制PV效应。

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