Wavelength-Selective Control of Visible Light Absorption through Capping-Assisted Oxygen Migration in Oxide Heterostructures

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-05-28 DOI:10.1021/acs.nanolett.5c01788

Jingxin Chen, Jin Young Oh, Boyu Li, Zhihan Qiao, Haiyang Zhang, Deyang Li, Enyang Men, Hangtian Wang, Shibo Xi, Kai Chen, Han Zhang, Hyoungjeen Jeen, Sang-Youn Park, Dongsheng Song, Hong Zhu, Woo Seok Choi, Lin Hao

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Abstract

Oxygen concentration critically determines the physical properties of transition metal oxides. In this work, we realized a subtle modulation of the oxygen concentration in heterostructures composed of perovskite SrTiO₃ (STO) and brownmillerite SrCoO_2.5 (BM-SCO) by deliberately promoting oxygen migration from the oxygen reservoir to BM-SCO with the assistance of STO capping. A small increase in the oxygen concentration was demonstrated to exclusively change the interorbital transition that is mostly related to the O 2p states in BM-SCO. The independent tuning of interorbital transition facilitates a wavelength-selective control of visible-light absorption. This results in a rich colorful appearance of the heterostructures, which depends on the thickness of the STO capping layer. The capping-assisted oxygen migration is expected to facilitate the designing and tailoring of emergent phenomena in oxygen-deficient oxides, even in the absence of a full topotactic phase transition.

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通过封顶辅助氧迁移在氧化物异质结构中的可见光吸收波长选择性控制

氧浓度决定了过渡金属氧化物的物理性质。在这项工作中，我们实现了由钙钛矿SrTiO3 （STO）和褐铁矿SrCoO2.5 （BM-SCO）组成的异质结构中氧气浓度的微妙调节，通过STO封盖有目的地促进氧气从氧气储层向BM-SCO的迁移。结果表明，氧浓度的微小增加只会改变BM-SCO中主要与o2p态有关的轨道间跃迁。轨道间跃迁的独立调谐有助于可见光吸收的波长选择性控制。这导致异质结构的丰富多彩的外观，这取决于STO封盖层的厚度。即使在没有完全拓扑相变的情况下，盖层辅助氧迁移也有望促进在缺氧氧化物中出现现象的设计和剪裁。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.