Thickness dependent absorption spectra in conjugated polymers: Morphology or interference?
Thickness dependent absorption spectra in conjugated polymers: Morphology or interference?
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DOI：
10.1063/1.3294636
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发表时间：
2010-02-01
影响因子：
4
通讯作者：
Burn, Paul L.
中科院分区：
文献类型：
--
作者：
Gaudin, Olivier P. M.;Samuel, Ifor D. W.;Burn, Paul L.
用反射率和变角椭圆偏振光谱法研究了聚[2-（2（′）-乙基己氧基）-5-甲氧基-1，4-亚苯基亚乙烯基]旋涂膜的吸收光谱随厚度的变化。据发现，对于厚度在18-178 nm范围内的膜，一组光学常数足以准确地模拟所有使用的实验数据，包括吸收光谱，独立于膜厚度或处理条件。因此，所观察到的吸收光谱随厚度的变化可以完全由反射率和干涉效应单独解释，而不需要调用膜之间的形态差异。
The thickness dependence of the absorption spectrum of spin-coated films of poly[2-(2(')-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] has been studied using reflectivity and variable angle spectroscopic ellipsometry measurements. It is found that, for films with thicknesses in the range of 18-178 nm, a single set of optical constants is sufficient to simulate accurately all the experimental data used, including the absorption spectra, independently of the film thickness or the processing conditions. Thus, the observed changes in the absorption spectrum with thickness can be fully accounted for by reflectivity and interference effects alone without the need to invoke morphology differences between films.