摘要
用溶胶 -凝胶法制备了不同组分的 Mgx Zn1-x O薄膜 . X射线衍射结果表明 ,薄膜为具有六角纤锌矿结构的纳米薄膜 ,晶粒尺寸 3～ 5 nm,随着 Mg进入 Zn O晶格 ,其晶格常数变小 .紫外 -可见吸收光谱表明 ,随着 Mg含量的增加带隙变宽 ,自由激子吸收峰明显蓝移 .室温光致发光光谱由很强的且与氧空位相关的深能级缺陷发光和较弱的紫外激子发光组成 ,激子发光强度和缺陷发光强度比随 x的增大而减小 ,表明 Mg原子进入 Zn O晶格会引起深能级缺陷的增加 . Mg0 .0 3 Zn0 .97O薄膜经 70 0℃热氧化后 ,紫外与可见发光强度比达到 3 0 .
Nanofilms of Mg xZn 1-xO with different Mg contents were fabricated by sol-gel method. The XRD spectra indicated that the films were hexagonal wurtzite structure with 3-5 nm grain size and the lattice constant of Mg xZn 1-xO gradually decreased with increasing Mg content. The UV-Vis absorption spectra showed that the band gap energy increased and the exciton peak had an obvious blue-shift with increasing Mg content. The strong deep level emission demonstrated that oxygen vacancy increased with the content of Mg atoms entering ZnO lattice. To obtain high quality Mg xZn 1-xO thin films, Mg 0.03Zn 0.97O film was annealed at 700 ℃ in oxygen ambient. The UV-Vis absorption spectrum and the PL spectrum demonstrated that high quality films could be obtained by annealing.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第10期1830-1833,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金 (批准号 :60 1760 0 3 )资助
