journal article·2024-04

Charge Carriers Localization Effect Revealed through Terahertz Spectroscopy of MXene: Ti3C2Tx

Enen Li, Jincheng Wei, Tianyu Zhang, Hujie Wan, Yuguang Cheng, Jiafeng Xie, Hong Li, Kai Zhang, Jingyin Xu, Jinkang Hu, Qiye Wen, Xu Xiao, Tao Zhao, Min Hu, Fuhai Su, Tianwu Wang, Guangyou Fang

Small· Volume 20· Issue 16
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Abstract

Abstract The transport properties of charge carriers in MXene, a promising material, have been studied using terahertz time‐domain spectroscopy (THz‐TDS) to examine its potential applications in optical and electronic devices. However, previous studies have been limited by narrow frequency ranges, which have hindered the understanding of the intrinsic mechanisms of carrier transport in MXenes. To address this issue, ultrabroadband THz‐TDS with frequencies of up to 15 THz to investigate the complex photoconductances of MXene (Ti3C2Tx) films with different thicknesses are employed. The findings indicate that the electronic localization is substrate‐dependent, and this effect decreases with an increase in the number of layers. This is attributed to the screening effect of the high carrier density in Ti3C2Tx. Additionally, the layer‐independent photocarrier relaxations revealed by optical pump THz probe spectroscopy (OPTP) provide evidence of the carrier heating‐induced screening effect. These results are significant for practical applications in both scientific research and various industries.
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Research context

OpenAlex topics: MXene and MAX Phase Materials · 2D Materials and Applications · Advanced biosensing and bioanalysis techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Aerospace Information Research Institute Chinese Academy of Sciences Beijing 100094 China

Key Laboratory of Electromagnetic Radiation and Sensing Technology Chinese Academy of Sciences Beijing 100190 China

School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences Beijing 100049 China

GBA Branch of Aerospace Information Research Institute Chinese Academy of Sciences Guangzhou 510700 China

Guangdong Provincial Key Laboratory of Terahertz Quantum Electromagnetics Guangzhou 510700 China

School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu Sichuan 610054 P. R. China

Key Laboratory of Terahertz Technology Ministry of Education Chengdu 610054 China

Yangtze Delta Region Institute (Huzhou) University of Electronic Science and Technology of China Huzhou Zhejiang 313001 P. R. China

State Key Laboratory of Electronic Thin Film and Integrated Devices School of Physics University of Electronic Science and Technology of China Chengdu 610054 China

Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen 518000 China

Chengdu Research Institute University of Electronic Science and Technology of China Chengdu 610207 China

Key Laboratory of Materials Physics Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei 230031 China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Science and Technology Planning Project of Guangdong Province · Natural Science Foundation of Sichuan Province · Fundamental Research Funds for the Central Universities

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