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首页> 外文期刊>Journal of nano research >Annealing Temperature Dependence of Optical Properties of Sol-Gel ZnO Thin Films with Different Sol Aging Time
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Annealing Temperature Dependence of Optical Properties of Sol-Gel ZnO Thin Films with Different Sol Aging Time

机译：溶胶老化时间对Sol-Gel ZnO薄膜光学性能的退火温度依赖性

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摘要

ZnO thin films on glass substrates have been successfully fabricated by sol-gel method for various aging time and annealing temperature. X-ray diffraction (XRD) patterns showed the crystallites at (100), (002) and (101) plane of hexagonal wurtzite structure. Atomic force microscope (AFM) images were used to investigate the surface morphology. The transmittance, energy gap, Urbach energy and photoluminescence (PL) of samples were investigated to explore the effects of annealing temperature on optical properties of ZnO thin films under different sol aging time. The transmittance spectra of thin films aged for 24 hours and 48 hours revealed the enhanced transmittance in visible region as rising annealing temperature, also, the optical band gap of the samples increased and Urbach energy decreased. The photoluminescence (PL) spectra of samples aged for 24 hours and 48 hours were studied and found the increased ultraviolet emission at similar to 387 nm, and various decreased visible emissions with rising annealing temperature. Nevertheless, the excessive sol aging time for 72 hours deteriorated the optical characteristics of thin films, resulting in that transmittance, energy gap and ultraviolet emission declined, and visible emissions increased with rising annealing temperature. The optical performances of the ZnO films aged for different time have no the same dependence of annealing temperature.
机译：通过溶胶-凝胶法在不同的时效时间和退火温度下成功地在玻璃基板上制备了ZnO薄膜。 X射线衍射（XRD）图谱显示了六方纤锌矿结构的（100），（002）和（101）面的微晶。原子力显微镜（AFM）图像用于研究表面形态。研究了样品的透射率，能隙，Urbach能量和光致发光（PL），以探讨退火温度对ZnO薄膜在不同溶胶老化时间下光学性能的影响。分别老化24小时和48小时的薄膜的透射光谱表明，随着退火温度的升高，可见光区域的透射率增加，并且样品的光学带隙增加，Urbach能量降低。研究了分别老化24小时和48小时的样品的光致发光（PL）光谱，发现随着387纳米退火温度的升高，紫外线的发射量增加了，接近387 nm，可见光的发射量却有所下降。然而，过长的72小时溶胶老化时间使薄膜的光学特性劣化，导致透射率，能隙和紫外线发射降低，并且可见光发射随着退火温度升高而增加。不同时间老化的ZnO薄膜的光学性能对退火温度的依赖性不同。

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