摘要
通过溶胶凝胶(sol-gel)法分别在玻璃衬底上制备了ZnO纳米薄膜和ZnO-SiO2纳米复合薄膜,并利用紫外-可见光分光光度计对薄膜的光学性能进行了分析.可见光-紫外透射谱显示,随着ZnO溶胶浓度从0.7mol/L降低到0.006mol/L,制备的ZnO薄膜从只出现一个380nm(对应的光学禁带宽度为3.27eV)左右的吸收边到在380和320nm(对应的光学禁带宽度为3.76eV)左右各出现一个吸收边,并且随着ZnO溶胶浓度的降低,在380—320nm波段内的透过率明显提高.而ZnO-SiO2复合薄膜只在310nm左右出现一个吸收边.SiO2的包覆宽化了ZnO的禁带宽度,包覆后的禁带宽度可达到3.87eV.
ZnO and ZnO-SiO2 nano-scale thin films were deposited on glass substrates by the sol-gel method. The ultraviolet（ UV）visible speetrophotometer was used to analyze their optical properties. The UV-visible transmittance spectra of ZnO films showed that when the mole concentration of ZnO precursor decreased from 0.7 to 0.06 mol/L, besides the absorption edge at 380 nm, a new absorption edge around 320 nm appeared. Furthermore the decrease of mole concentration of ZnO precursor improved the transmittance in the range between 380 and 320 nm. However, ZnO-SiO2 nano-seale thin films only have one absorption edge at 310 nm. The optical band gap of ZnO was enlarged when deposited in SiO2 matrix.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第4期2537-2542,共6页
Acta Physica Sinica
基金
江苏省自然科学基金(批准号:BK2006042)资助的课题~~
