Investigation into the carrier recombination in Sb2Se3: Photo thermal effect, trapped carrier absorption and hot carrier cooling

IF 2 3区化学 Q4 CHEMISTRY, PHYSICAL

Chemical Physics Pub Date : 2024-09-15 DOI:10.1016/j.chemphys.2024.112448

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Abstract

Understanding the carrier recombination processes in Sb₂Se₃ is essential for its optoelectronic applications. In this work, carrier recombination dynamics in Sb₂Se₃ were studied by broad band transient absorption spectroscopy. Firstly, the contribution of photothermal effect to the transient absorption spectrum was thoroughly discussed. It is confirmed that the excited state absorption (ESA) band with lifetime of several nanoseconds results from co-contribution of photo thermal effect and deep trapped carrier absorption. Secondly, the features of transient absorption spectrum on picosecond time scale were interpreted. The short-lived ESA band around 1000 nm was assigned to shallow trapped carrier absorption, while not band gap renormalization (BGR) or free carrier absorption. By globally fitting the transient absorption spectrum, the hot carrier cooling time and time constant for free carrier relax into deep trap state were determined to be 0.25∼0.45 ps and 3.1∼8.7 ps, respectively. Finally, we built up the carrier recombination model of Sb₂Se₃. The experimental results in this work will improve the understanding on the carrier recombination in Sb₂Se₃.

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对 Sb2Se3 中载流子重组的研究：光热效应、被困载流子吸收和热载流子冷却

了解 Sb2Se3 中的载流子重组过程对其光电应用至关重要。本研究利用宽带瞬态吸收光谱对 Sb2Se3 中的载流子重组动力学进行了研究。首先，深入讨论了光热效应对瞬态吸收光谱的贡献。研究证实，激发态吸收（ESA）带的寿命为几纳秒，是光热效应和深陷载流子吸收共同作用的结果。其次，解释了皮秒时间尺度上的瞬态吸收光谱特征。波长在 1000 纳米左右的短寿命 ESA 波段被认为是浅层困载流子吸收，而不是带隙重正化（BGR）或自由载流子吸收。通过全局拟合瞬态吸收光谱，确定了热载流子冷却时间和自由载流子弛豫到深阱态的时间常数分别为 0.25∼0.45 ps 和 3.1∼8.7 ps。最后，我们建立了 Sb2Se3 的载流子重组模型。这项工作的实验结果将加深人们对 Sb2Se3 中载流子重组的理解。

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

Chemical Physics 化学-物理：原子、分子和化学物理

CiteScore

4.60

自引率

4.30%

发文量

278

审稿时长

39 days

期刊介绍： Chemical Physics publishes experimental and theoretical papers on all aspects of chemical physics. In this journal, experiments are related to theory, and in turn theoretical papers are related to present or future experiments. Subjects covered include: spectroscopy and molecular structure, interacting systems, relaxation phenomena, biological systems, materials, fundamental problems in molecular reactivity, molecular quantum theory and statistical mechanics. Computational chemistry studies of routine character are not appropriate for this journal.