Impacts of thickness reduction and heat treatment on the optical properties of thin chalcogenide films
Impacts of thickness reduction and heat treatment on the optical properties of thin chalcogenide films
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DOI：
10.1016/j.ceramint.2017.05.143
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发表时间：
2017-10
影响因子：
5.2
通讯作者：
A. Adam;P. Petkov
中科院分区：
文献类型：
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作者：
A. Adam;P. Petkov
用真空热蒸发技术在高度洁净的载玻片上沉积了不同厚度的铋基硫族化合物薄膜。本文研究了热退火对不同厚度的Bi_2Te_3-Bi_2Se_3薄膜光学性质的影响。记录的光学透射率和反射率的波长依赖性，对于所制备的和退火的膜，在从350至2700 nm的波长范围内，使用双光束分光光度计。根据测得的光谱和薄膜厚度，推导了薄膜的吸收系数和能带隙等基本光学性质。我们在本工作中证明，退火和厚度减小的协同作用可以用于提高透光率，从而用于包括透明导电电极在内的光电应用。
Bi-based chalcogenides, in the form of thin crystalline films, were deposited at different thicknesses onto highly cleaned glass slides with the aid of vacuum thermal evaporation technique. The influence of thermal annealing on the optical properties of Bi2Te3-Bi2Se3films at different thicknesses is investigated in this work. Wavelength dependence of the optical transmittance and reflectance was recorded, for the as-prepared and the annealed films, in the wavelength range from 350 to 2700 nm using a double beam spectrophotometer. Fundamental optical properties such as absorption coefficient and energy band gap were derived based on the measured spectra and film's thickness. We demonstrate in the present work that the synergy of annealing and thickness reduction can be exploited for light transmittance enhancements, and consequently for optoelectronic applications including transparent conductive electrodes.