The band gap, linear refractive indices and absorption coefficients fundamental optical constants of the film were obtained through optical transmittance measurements.

用光学透射测量方法得到了该薄膜材料的基本光学常数（带隙、线性折射率、线性吸收系数）。

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The ultraviolet absorption peak narrows, absorption intensity increases, the absorption margin becomes steep and moves to longer wavelength, the optical band gap decreases as well.

紫外吸收峰变窄，强度增加，吸收边变得陡峭并向长波方向移动，光学带隙降低。

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It also showed that the optical absorption edge of the annealed film appeared shifted towards the longer wavelength side and the band gap decreased by 0.

光学性质显示退火处理的薄膜吸收边缘明显的向长波的方向移动，发生红移现象，而且禁带宽度减少了0。

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