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首页> 外文期刊>Journal of Physics. Condensed Matter >Optical properties and molecular orientation in organic thin films
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Optical properties and molecular orientation in organic thin films

机译：有机薄膜的光学性质和分子取向

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The optical properties and the molecular orientation in thin films of 3,4,9, 10-perylenetetracarboxylic dianhydride (PTCDA) and N, N'-dimethyl-3,4,9, 10-perylenetetracarboxylic diimide (DiMePTCDI) were studied by means of variable angle spectroscopic ellipsometry (VASE), atomic force microscopy (AFM), near edge x-ray absorption fine structure (NEXAFS) spectroscopy, and infrared (IR) and Raman spectroscopy. VASE reveals that both kinds of film exhibit a strong optical anisotropy. For PTCDA, the optical constants are found to have much higher values in the substrate plane than perpendicular to it. While the anisotropy measured in the substrate plane on passivated GaAs(100) is very small for PTCDA a giant anisotropy is observed for DiMePTCDI. This difference in the optical properties is attributed to the different orientation of molecules in the thin organic films. While the PTCDA molecules lie flat on the substrate with their molecular plane parallel to the substrate surface, the DiMePTCDI molecules are tilted with respect to the substrate surface and are predominantly oriented with their long axis parallel to the [0 11] direction of the substrate as confirmed by VASE, NEXAFS, and Raman and IR results. [References: 37]
机译：分别用3,4,9,10-per四羧酸二酐（PTCDA）和N，N'-二甲基-3,4,9,10-per四羧酸二酰亚胺（DiMePTCDI）研究了薄膜的光学性质和分子取向。变角椭圆偏振光谱法（VASE），原子力显微镜（AFM），近边缘X射线吸收精细结构（NEXAFS）光谱，红外（IR）和拉曼光谱。 VASE表明，两种膜都表现出很强的光学各向异性。对于PTCDA，发现光学常数在基板平面中的值比垂直于其的值高得多。尽管对于PTCDA，在钝化的GaAs（100）上在衬底平面上测得的各向异性非常小，但对于DiMePTCDI，却观察到了巨大的各向异性。光学性质的这种差异归因于有机薄膜中分子的不同取向。当PTCDA分子以分子平面平行于基底表面的方式平放在基底上时，DiMePTCDI分子相对于基底表面倾斜，并且主要以其长轴平行于基底[0 11]方向取向。由VASE，NEXAFS以及拉曼和IR结果确认。 [参考：37]

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