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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