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arXiv 2503.00544cond-mat.mtrl-sci
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脉冲激光沉积BiFeO3薄膜中沉积温度对载流子的调控

Tailoring of charge carriers with deposition temperature in pulsed laser deposited BiFeO3 thin films

Viswajit R S, Jinesh K. B, Ashok K

AI总结:

本研究通过脉冲激光沉积在400-700°C下制备BiFeO3薄膜,发现随沉积温度升高,薄膜电导率从n型转变为p型,分别由氧空位和铋空位引起,为非易失性存储和神经形态器件应用提供了新途径。

摘要:

本研究探讨了在400°C至700°C不同沉积温度下,通过脉冲激光沉积在硅和玻璃基底上制备的多晶BiFeO3薄膜的结构、拓扑、电学和光学性质。X射线衍射证实了菱方相,X射线光电子能谱显示薄膜符合化学计量比。由吸收光谱得到的薄膜光学带隙随基底温度升高而增大。光致发光光谱揭示了缺陷,原子力显微镜分析表明表面形貌和结晶度随温度改善。电荷传输研究表明,电导率从低温沉积的n型转变为高温沉积的p型,分别归因于氧空位和铋空位。对电导率调控及BiFeO3薄膜漏电特性的深入理解,为非易失性存储器,特别是神经形态器件的应用开辟了途径。

英文摘要:

This research investigates the structural, topological, electrical and optical properties of pulsed laser deposited polycrystalline BiFeO3 thin films on silicon and glass substrate at varying deposition temperatures ranging from 400 degC to 700 degC. X-ray diffraction confirm rhombohedral phase and X-ray photoelectron spectroscopy reveals stoichiometric BiFeO3 films. The optical bandgap of thin films obtained from absorption spectra increases with the substrate temperature. Photoluminescence emission spectrum reveals the defects and Atomic Force Microscopy analysis bring out the surface topography and crystallinity improvement with temperature. The charge transport studies reveal a transition in conductivity from n-type at lower deposition temperature to p-type at higher deposition temperature, attributed to oxygen and bismuth vacancies respectively. The intricate understanding of conductivity tuning and the leaky nature of BiFeO3 thin film opens avenues for applications in nonvolatile memories, particularly neuromorphic devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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