溶胶-凝胶法制备的PbTiO_3薄膜的光学性质研究

OPTICAL PROPERTIES OF PbTiO_3 THIN FILMS PREPARED BY A MODIFIED SOL-GEL PROCESSING

采用溶胶 凝胶法在石英玻璃衬底上制备出均匀透明的无定形PbTiO3 薄膜 ,并对其光学性质进行了详细的研究 ,发现其折射率的波形符合经典的Cauchy函数 .由半导体理论计算得到无定形PbTiO3 薄膜的光学禁带宽度为 3.84eV .FTIR透射光谱研究表明无定形PbTiO3 薄膜在中红外波段没有吸收峰出现 .对于在 5 5 0℃下快速热退火得到的PbTiO3 薄膜 ,通过远红外反射光谱测量 ,观察到了

Uniform and transparent PbTiO3 amorphous thin films were deposited on the quart glass substrate using a modified sol-gel processing. The optical properties of PbTiO3 amorphous thin films were investigated in detail. The refractive index was calculated and in good agreement with Cauchy function. The optical band gap of the PbTiO3 amorphous thin films was obtained about 3.84 eV using semiconductor theoretical calculation. The FTIR spectrum investigation of the PbTiO3 amorphous thin films shows that no absorption appears in the mid-infrared region. Six IR active phonon modes were observed in the PbTiO3 thin films annealed at 550degreesC by far-infrared reflectance spectra.