Spectroscopic ellipsometry of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA)
Spectroscopic ellipsometry of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA)
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3,4,9,10-苝四甲酸二酐 (PTCDA) 的光谱椭圆光度法
DOI：
10.1007/s00339-002-1595-1
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
W. K. Chan
中科院分区：
文献类型：
--
作者：
A. Djurišiĉ;C. Kwong;W. L. Guo;Z. T. Liu;H. Kwok;W. K. Chan
用椭偏光谱法测定了PTCDA的光学功能。在玻璃基板上热蒸发制备PTCDA样品。研究了衬底温度对PTCDA薄膜性能的影响。这里研究的最低底物温度是室温。在室温和更高的衬底温度下，我们没有观察到蒸发薄膜的有序性，这将导致高各向异性，而在极低温度下通过有机分子束沉积生长的PTCDA薄膜（所谓的准外延生长）。因此，假定样品是各向同性的。得到的介电函数虚部表现出预期的特征：在370 nm附近有一个低等峰，在400-600 nm光谱区域有一个更高等的双峰结构。
The optical functions of PTCDA have been determined by spectroscopic ellipsometry. The samples were prepared by thermal evaporation of PTCDA on glass substrates. The influence of the substrate temperature on the properties of PTCDA films has also been investigated. The lowest substrate temperature investigated here was room temperature. At room temperature and higher substrate temperatures, we have not observed ordering of the evaporated films, which would result in high anisotropy, as reported for PTCDA films grown by organic molecular-beam deposition at very low temperatures (so-called quasi-epitaxial growth). Therefore, the samples have been assumed to be isotropic. The obtained imaginary part of the dielectric function exhibits the expected features: a low-magnitude peak around 370 nm and a higher magnitude, two-peak structure in the 400–600 nm spectral region.