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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Enhancement of photoelectric conversion properties of SrTiO3/alpha-Fe2O3 heterojunction photoanode
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Enhancement of photoelectric conversion properties of SrTiO3/alpha-Fe2O3 heterojunction photoanode

机译：增强SrTiO3 /α-Fe2O3异质结光电阳极的光电转换性能

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摘要

The semiconductor films of SrTiO3, alpha-Fe2O3 and their heterojunction SrTiO3/alpha-Fe2O3 were prepared on FTO (SnO2 : F on glass) substrates by the spin-coating method and their structures and properties were characterized by XRD, SEM and photoelectrochemical measurements, respectively. It was observed that the photocurrent and the incident photon to current conversion efficiencies (IPCE or external quantum efficiencies) of the SrTiO3/alpha-Fe2O3 heterojunction were higher than that of the single SrTiO3 or alpha-Fe2O3 film, particularly under visible light irradiation. The band structures of SrTiO3 and alpha-Fe2O3 were calculated. It was found that the charge carriers in alpha-Fe2O3 had large effective masses while the charge carriers in SrTiO3 had small effective masses at the bottom of the conduction band and at the top of the valence band, which meant weak mobility of holes photo-generated in alpha-Fe2O3 and strong mobility of holes excited in SrTiO3. As to the SrTiO3/alpha-Fe2O3 heterojunction, the special valence band structures of SrTiO3 improved the separation efficiency of charge carriers which had been photo-generated in alpha-Fe2O3. This led to the enhancement of photocurrent densities and external quantum efficiencies in the SrTiO3/alpha-Fe2O3 heterojunction photoanode.
机译：通过旋涂法在FTO（玻璃上的SnO2：F）衬底上制备了SrTiO3，α-Fe2O3及其异质结SrTiO3 /α-Fe2O3半导体膜，并通过XRD，SEM和光电化学测量对其结构和性能进行了表征，分别。观察到，特别是在可见光照射下，SrTiO3 /α-Fe2O3异质结的光电流和入射光子到电流的转换效率（IPCE或外部量子效率）要高于单个SrTiO3或α-Fe2O3膜。计算了SrTiO3和α-Fe2O3的能带结构。发现α-Fe2O3中的载流子具有较大的有效质量，而SrTiO3中的载流子在导电带的底部和价带的顶部具有较小的有效质量，这意味着光生空穴的弱迁移性α-Fe2O3中的元素和SrTiO3中激发的空穴的强迁移率。对于SrTiO3 /α-Fe2O3异质结，SrTiO3的特殊价带结构提高了在α-Fe2O3中光生的电荷载流子的分离效率。这导致SrTiO3 /α-Fe2O3异质结光阳极中光电流密度和外部量子效率的提高。

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