Carrier extraction from metallic perovskite oxide nanoparticles.
Carrier extraction from metallic perovskite oxide nanoparticles.
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DOI：
10.1039/d1nr02890a
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发表时间：
2021-07
期刊：
影响因子：
6.7
通讯作者：
Calum McDonald;C. Ni;V. Švrček;M. Macias‐Montero;T. Velusamy;P. Connor;P. Maguire;J. Irvine;D. Mariotti
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文献类型：
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作者：
Calum McDonald;C. Ni;V. Švrček;M. Macias‐Montero;T. Velusamy;P. Connor;P. Maguire;J. Irvine;D. Mariotti
我们观察到在钙钛矿氧化物，贫锶铌酸锶（Sr0.9NbO3）中，两种类型的能带之间激发的载流子的萃取。Sr0.9NbO3具有金属性质和高导电性，同时在紫外，可见光和近红外光谱区域具有广泛的吸收，使其成为太阳能转换的有吸引力的材料。此外，铌酸锶的光电性能可以很容易地通过改变Sr分数或掺杂来调节。缺锶铌酸锶表现出分裂的导带，这使得两种类型的光学跃迁：带内和带间。然而，这种载体能否从这种不寻常的材料中提取出来仍未得到证实。在本报告中，我们通过制造一层极薄的Sr0.9NbO3纳米粒子吸收层，克服了光载流子提取的巨大挑战。这些发现为在减少复合损失的情况下获得非常广泛的太阳光谱吸收范围开辟了巨大的机会。
We observe the extraction of carriers excited between two types of bands in the perovskite oxide, Sr-deficient strontium niobate (Sr0.9NbO3). Sr0.9NbO3 exhibits metallic behaviour and high conductivity, whilst also displaying broad absorption across the ultraviolet, visible, and near-infrared spectral regions, making it an attractive material for solar energy conversion. Furthermore, the optoelectronic properties of strontium niobate can easily be tuned by varying the Sr fraction or through doping. Sr-deficient strontium niobate exhibits a split conduction band, which enables two types of optical transitions: intraband and interband. However, whether such carriers can be extracted from an unusual material as such remains unproven. In this report, we have overcome the immense challenge of photocarrier extraction by fabricating an extremely thin absorber layer of Sr0.9NbO3 nanoparticles. These findings open up great opportunities to harvest a very broad solar spectral absorption range with reduced recombination losses.