Ultrafast carrier dynamics and transient nonlinear absorption in chalcogenide perovskite BaZrS3

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-11-05 DOI:10.1063/5.0228009

Pengxian You, Yadong Han, Junhong Yu, Yunfan Yang, Yakun Cao, Xiangyin Zhou, Liang Qiao, Jianbo Hu

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引用次数: 0

Abstract

The unique combination of excellent semiconducting properties in halide perovskites and the high stability and nontoxicity of oxide perovskites has led to a recent surge in interest in chalcogenide perovskite BaZrS3 for optoelectronic applications. However, to realize its potential in future device technologies, a comprehensive understanding of photoexcited carrier dynamics and transient optical response is imperative, yet it remains largely unexplored for BaZrS3. In this work, employing transient absorption spectroscopy, we have revealed that photoexcited carriers in epitaxial BaZrS3 nanofilms exhibit two exponential decay components relating to optical phonon cooling and interband recombinations. Meanwhile, our investigation unveils an intriguing transient nonlinear absorption phenomenon in BaZrS3, characterized by the ultrafast switching of the pump-induced transparency (i.e., the saturable absorption) to the absorption enhancement within a timescale commensurate with the measurement resolution (hundreds of femtosecond). This study provides crucial dynamic insights essential for leveraging chalcogenide perovskites, such as BaZrS3, in the development of advanced optoelectronic devices.

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钙钛矿包晶 BaZrS3 中的超快载流子动力学和瞬态非线性吸收

卤化物类包晶石具有优异的半导体特性，而氧化物类包晶石则具有高稳定性和无毒性，这两种特性的独特结合使人们最近对用于光电应用的掺杂包晶石 BaZrS3 产生了浓厚的兴趣。然而，要实现其在未来器件技术中的潜力，全面了解光激发载流子动力学和瞬态光学响应势在必行，但对于 BaZrS3 而言，这一点在很大程度上仍未得到探索。在这项工作中，我们利用瞬态吸收光谱揭示了外延 BaZrS3 纳米薄膜中的光激发载流子表现出与光学声子冷却和带间重组有关的两个指数衰减成分。同时，我们的研究揭示了 BaZrS3 中一种有趣的瞬态非线性吸收现象，其特征是在与测量分辨率（数百飞秒）相称的时间尺度内，从泵浦诱导的透明（即可饱和吸收）到吸收增强的超快切换。这项研究为开发先进的光电器件提供了重要的动态见解，对利用BaZrS3等钙钛矿包晶石至关重要。

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

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.