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Temperature dependence of optical bandgap in C60 polycrystalline films

✍ Scribed by Chih-Feng Su; Sheng-Shin Wang; Shiow-Jing Tang; Jyh-Shyang Wang; Kuan-Cheng Chiu

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
788 KB
Volume
405
Category
Article
ISSN
0921-4526

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✦ Synopsis

Temperature-dependent optical transmission is performed on C 60 polycrystalline films of various thicknesses with incident photon energies from 1.46 to 2.07 eV. Remarkable absorption peaks together with the dependence of peak intensity on film thickness are observed and explained in terms of an energy terms diagram that accounts for the gap evolution from energy levels (related to free C 60 molecules) to energy bands (attributed to molecular C 60 solid). The interplay of strong intramolecular chemical bonds and weak intermolecular van der Waals bonds is also discussed. Then, the temperature dependence of bandgap E g (T) is deduced from the transmission spectra for thick polycrystalline C 60 films. From a numerical fit of E g (T), the fitting parameters associated with electron-phonon interaction are obtained for this molecular C 60 solid and are compared with those for other inorganic semiconducting solids.

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