直流反应磁控溅射法制备了WO3薄膜,薄膜在723K纯N2气中被退火处理.热处理前WO3薄膜为无定形态,热处理后为多晶态.采用透射谱和单谐振子模型获得了薄膜的折射率和消光系数,得到退火前后谐振子能量分别为5.77和5.28eV,色散能为19.9和15.9eV.分析表明退火前后吸收边附近均表现出间接带隙的两段线性关系,间接带隙分别为3.14和2.96eV,声子能量为32和149meV,退火后带隙减小推测可能是由于退火薄膜晶化,氧填隙粒子导致的带尾态效应消失的结果.
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