Low-temperature transport and relaxation of photo-carriers in TiS2

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2024-11-26 DOI:10.1063/5.0235742

Ruan Zhang, Shuangxing Zhu, Chaofan Wang, Jiaxin Wu, Junning Mei, Ying Liu, Yu Chen, Qiyi Wu, Chen Zhang, Mingyuan Huang, Jianqiao Meng, Xinghan Cai

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Abstract

The investigation of non-equilibrium carrier dynamics in two-dimensional semi-metallic materials, particularly at low temperatures, is crucial for elucidating their fundamental properties, including carrier–carrier interactions and electron–phonon scattering mechanisms. In this study, we examine the behavior of 1T-TiS2, utilizing scanning photocurrent microscopy, bias voltage-adjustable photoresponse measurements, and pump-probe techniques to explore the temperature-dependent transport and relaxation of photo-excited charge carriers. We observe a non-monotonic intrinsic photocurrent in the biased device, with a pronounced peak feature occurring at approximately 25 K, which is corroborated by pump-probe measurements that reveal a similar peak in the magnitude and relaxation time of the differential reflectance as a function of the temperature. Our results highlight the unique carrier dynamics in TiS2, offering valuable insights for the design of TiS2-based optoelectronic devices that can operate effectively across a wide temperature range.

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研究二维半金属材料中的非平衡载流子动力学，尤其是低温下的非平衡载流子动力学，对于阐明其基本特性（包括载流子-载流子相互作用和电子-声子散射机制）至关重要。在这项研究中，我们利用扫描光电流显微镜、偏置电压可调光响应测量和泵探针技术来研究 1T-TiS2 的行为，探索光激发电荷载流子随温度变化的传输和弛豫。我们在偏压器件中观察到非单调的本征光电流，在大约 25 K 时出现一个明显的峰值特征，而泵探法测量也证实了这一点，测量结果显示，差分反射率的大小和弛豫时间与温度的函数关系出现了类似的峰值。我们的研究结果突显了 TiS2 中独特的载流子动力学，为设计基于 TiS2 的光电器件提供了宝贵的见解，这种器件可以在很宽的温度范围内有效工作。

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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.