Structural, Photoluminescence, and Field Emission Properties of Vertically Well-Aligned ZnO Nanorod Arrays

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• 作者：Chun Li ; Guojia Fang ; Nishuang Liu ; Jun Li ; Lei Liao ; Fuhai Su ; Guohua Li ; Xiaoguang Wu ; Xingzhong Zhao
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：August 30, 2007
• 年：2007
• 卷：111
• 期：34
• 页码：12566 - 12571
• 全文大小：548K
• 年卷期：v.111,no.34(August 30, 2007)
• ISSN：1932-7455

文摘

The self-assembled growth of vertically well-aligned ZnO nanorod arrays with uniform length and diameteron Si substrate has been demonstrated via thermal evaporation and vapor-phase transport. The structural,photoluminescence (PL), and field emission properties of the as-prepared nanorod arrays were investigated.The PL spectrum at 10 K shows a strong and sharp near-band gap emission (NBE) peak (full width at half-maximum (FWHM) = 4.7 meV) and a weak neglectable deep-level emission (DL) peak (I_NBE/I_DL= 220),which implies its good crystallinity and high optical quality. The room-temperature NBE peak was deducedto the composition of free exciton and its first-order replicas emissions by temperature-dependent PL spectra.The field emission measurements indicate that, with a vacuum gap of 400 m, the turn-on field and thresholdfield is as low as 2.3 and 4.2 V/m. The field enhancement factor and vacuum gap d follows a universalequation.