Hot carriers decay dynamics of van der Waals room temperature ferroelectric α-In2Se3

IF 2.9 3区化学 Q3 CHEMISTRY, PHYSICAL

Physical Chemistry Chemical Physics Pub Date : 2025-09-24 DOI:10.1039/d5cp02156a

Chunlian Li, Borong Cong, Jiajun Cao, Weizheng Liang, Bingsuo Zou

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Abstract

In this paper, we investigated the hot carriers decay dynamics of two-dimensional room temperature ferroelectric α-In₂Se₃ via femtosecond transient optical spectroscopy. The photo-excited hot carriers in α-In₂Se₃ are decay via electron-phonon coupling (τ₁) and inter–layer charge transfer (τ₂). We observe the slope of the τ₁^-1-T curve changed near 145 K, which indicating the change of temperature-dependent phonon excitation of α-In₂Se₃. Below 145 K, the dephase rate τ₂^-1 show an unusual temperature dependence, τ₂^-1 ∝ T⁻¹, while it exhibiting a linear increase with temperature above 145 K. The temperature-dependent variation of hot-carrier decay in In₂Se₃ near 145 K may be related to a hidden phase transition. The dephase rate (τ₁^-1 ) exhibits a stronger temperature dependence below 145 K than above, which may arise from the more pronounced temperature dependence of optical phonon excitation at lower temperatures.

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室温铁电α-In2Se3的热载流子衰减动力学

本文利用飞秒瞬态光谱技术研究了二维室温铁电体α-In2Se3的热载流子衰变动力学。α-In2Se3中的光激发热载流子通过电子-声子耦合（τ1）和层间电荷转移（τ2）衰变。我们观察到τ1-1-T曲线的斜率在145 K附近发生了变化，这表明α-In2Se3的声子激发随温度的变化。在145k以下，脱相率τ2-1表现出反常的温度依赖性，τ2-1∝T−1，而在145k以上，脱相率随温度的升高呈线性增长。在145k附近，In2Se3中热载子衰变的温度依赖性变化可能与隐藏相变有关。失相率τ1-1在145 K以下表现出较强的温度依赖性，这可能是由于在较低温度下光学声子激发的温度依赖性更明显。

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

Physical Chemistry Chemical Physics 化学-物理：原子、分子和化学物理

CiteScore

5.50

自引率

9.10%

发文量

2675

审稿时长

2.0 months

期刊介绍： Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.