Identifying the effect of photo-generated carriers on the phonons in rutile TiO2 through Raman spectroscopy

doi:10.1088/1674-1056/ad73b4

中国物理B ›› 2024, Vol. 33 ›› Issue (11): 117802-117802.doi: 10.1088/1674-1056/ad73b4

Identifying the effect of photo-generated carriers on the phonons in rutile TiO₂ through Raman spectroscopy

Zheng Wang(王征), Min Liao(廖敏), Guihua Wang(王桂花), and Meng Zhang(张梦)†

School of Electronic and Information Engineering, Beihang University, Beijing 100191, China

收稿日期:2024-06-27 修回日期:2024-08-06 接受日期:2024-08-27 出版日期:2024-11-15 发布日期:2024-11-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 52122008, 51978024, and 52370003) and the Science and Technology and Innovation Commission of Shen Zhen Municipality (Grant No. JCYJ20200109105212568).

Identifying the effect of photo-generated carriers on the phonons in rutile TiO₂ through Raman spectroscopy

Zheng Wang(王征), Min Liao(廖敏), Guihua Wang(王桂花), and Meng Zhang(张梦)†

School of Electronic and Information Engineering, Beihang University, Beijing 100191, China

Received:2024-06-27 Revised:2024-08-06 Accepted:2024-08-27 Online:2024-11-15 Published:2024-11-15
Contact: Meng Zhang E-mail:mengzhang10@buaa.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 52122008, 51978024, and 52370003) and the Science and Technology and Innovation Commission of Shen Zhen Municipality (Grant No. JCYJ20200109105212568).

摘要/Abstract

摘要： Investigating lattice vibrations through Raman spectroscopy is a crucial method for studying crystalline materials. Carriers can interact with lattices and influence lattice vibrations; thus, it is feasible to study the effect of photo-generated carriers on phonons by analyzing changes in the Raman spectra of semiconductors. Rutile is one of the predominant crystalline phases of TiO$_{2}$, which is a widely utilized metal oxide semiconductor. In this work, rutile TiO$_{2}$ is coated on a thinned optical fiber to concentrate ultraviolet light energy within the material, thereby enhancing the generation of carriers and amplifying the changes in the Raman spectra. A Raman detection laser with a wavelength of 532 nm is utilized to collect the Raman spectra of rutile TiO$_{2}$ during irradiation. Using this setup, the impact of photo-generated carriers on the phonons corresponding to Raman vibrational modes is researched. The localization and non-radiative recombination of photo-generated carriers contribute to a reduction in both the frequencies and lifetimes of phonons. This work provides a novel approach to researching the effect of carriers on phonons.

关键词: Raman spectroscopy, photo-generated carriers, rutile TiO$_{2}$, phonons

Abstract: Investigating lattice vibrations through Raman spectroscopy is a crucial method for studying crystalline materials. Carriers can interact with lattices and influence lattice vibrations; thus, it is feasible to study the effect of photo-generated carriers on phonons by analyzing changes in the Raman spectra of semiconductors. Rutile is one of the predominant crystalline phases of TiO$_{2}$, which is a widely utilized metal oxide semiconductor. In this work, rutile TiO$_{2}$ is coated on a thinned optical fiber to concentrate ultraviolet light energy within the material, thereby enhancing the generation of carriers and amplifying the changes in the Raman spectra. A Raman detection laser with a wavelength of 532 nm is utilized to collect the Raman spectra of rutile TiO$_{2}$ during irradiation. Using this setup, the impact of photo-generated carriers on the phonons corresponding to Raman vibrational modes is researched. The localization and non-radiative recombination of photo-generated carriers contribute to a reduction in both the frequencies and lifetimes of phonons. This work provides a novel approach to researching the effect of carriers on phonons.

Key words: Raman spectroscopy, photo-generated carriers, rutile TiO$_{2}$, phonons

中图分类号: (Photocarrier radiometry)

78.56.Cd

74.25.Kc (Phonons) 74.25.nd (Raman and optical spectroscopy) 61.82.Fk (Semiconductors)

Zheng Wang(王征), Min Liao(廖敏), Guihua Wang(王桂花), and Meng Zhang(张梦). Identifying the effect of photo-generated carriers on the phonons in rutile TiO₂ through Raman spectroscopy[J]. 中国物理B, 2024, 33(11): 117802-117802.

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Identifying the effect of photo-generated carriers on the phonons in rutile TiO₂ through Raman spectroscopy

Identifying the effect of photo-generated carriers on the phonons in rutile TiO₂ through Raman spectroscopy

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