Oxygen Vacancy: An Electron鈥揚honon Interaction Decoupler to Modulate the Near-Band-Edge Emission of ZnO Nanorods

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• 作者：Huaiyi Ding ; Zhi Zhao ; Guanghui Zhang ; Yukun Wu ; Zhiwei Gao ; Junwen Li ; Kun Zhang ; Nan Pan ; Xiaoping Wang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：August 16, 2012
• 年：2012
• 卷：116
• 期：32
• 页码：17294-17299
• 全文大小：462K
• 年卷期：v.116,no.32(August 16, 2012)
• ISSN：1932-7455

文摘

Through in situ control of the growth condition in the vapor phase transport and condensation, we intentionally prepared ZnO nanorods with different concentrations of oxygen vacancy (V_O), as confirmed by the X-ray photoelectron spectra. A spectral shift in the ultraviolet (UV) emission between these nanorods, as large as 80 meV, has been observed in the room temperature photoluminescence (PL) spectra, showing strong correlation to the V_O concentration. With the help of the variable-temperature PL, this spectral shift is clearly attributed to the different spectral contributions of the free exciton emission and its phonon replicas. Furthermore, a remarkable variation in the electron鈥損honon interaction strength among these samples is unambiguously revealed by the Raman spectra, which is in good consistence with the Huang鈥揜hys parameters obtained from the PL. This study implies that V_O in ZnO nanostructures not only modulates the visible emission as intensively previously investigated but also significantly suppresses the electron鈥損honon interaction strength and therefore tailor the UV (near-band-edge) emission property. This finding is useful to design and fabricate ZnO-based high-performance short-wavelength photonic and optoelectronic devices on the nanoscale.