Prof. Yukio Furukawa Profile

Prof. Yukio Furukawa

at Waseda Univ

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Proceedings Article | 12 January 2011 Paper

Raman and infrared spectroscopy of organic electronic devices

Y. Furukawa

Proceedings Volume 7993, 799320 (2011) https://doi.org/10.1117/12.880237

KEYWORDS: Raman spectroscopy, Thin films, Absorption, Infrared radiation, Crystals, Infrared spectroscopy, Infrared photography, Organic semiconductors, Molecules, Thin film devices

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We present Raman and infrared studies on the structures of organic semiconductor thin films used for electronic devices. The Raman spectra of crystalline and amorphous states of an organic semiconductor, N,N'-di-1-naphthaleyl-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPD), were measured. These states give rise to slightly different peak positions and widths of each Raman band. Raman images were observed for polycrystalline pentacene films evaporated on a silicon substrate. The structural defects were found in the images of the intensity ratio I₁₅₉₆/_I1533, which reflects the orientation of molecules i.e., crystalline domains. Photoinduced infrared absorption from the composite of regioregular poly(3-dodecylthiphene) and C₆₀ was measured by the difference FT-IR method. The observed absorption is attributable to photogenerated carriers. The action spectra of photoinduced infrared absorption are explained by electron transfer from photogenerated excited states on a polymer chain to C₆₀.

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