Abstract
Fullerene thin films of about 200 nm thicknesses have been deposited by thermal evaporation method on soda lime glass at substrate temperature 303 and 403K under pressure about 10-5 mbar. This study concentrated on the influence of substrate temperature on the optical properties of C60 thin films within the visible range. Optical characterization has been carried out at room temperature using the absorption spectra, at normal incidence, in range (200-900) nm.
 The absorption and extinction coefficients of the samples have been evaluated according to the variation in the UV- Visible spectrum. Increasing substrate temperature causes decreasing in optical band gap energy, for direct allowed transitions, and slightly changing in refractive index. This incident was due to the reducing of interatomic intervals, which may be correlating a decrease in the amplitude of atomic vibrations around their equilibrium sites.
Highlights
There is flexibility in synthesizing new molecules of organic semiconductors through inducing a change in the electronic properties of them by changing either the functional groups or atomic arrangement, and makes these organic semiconductors good candidates for optoelectronic applications [1].Iraqi Journal of Science, 2019, Vol 60, No.5, pp: 1006-1012Fullerenes molecules arrange at high symmetric sites
The results show that both onset and fundamental energy gaps are decreased from 2.40 eV for the film deposited at 303K to 2.35 eV for film deposited at 403K corresponds to the so-called onset energy gap (Q-band) while the absorption energy gap decreased from 3.30 eV for film deposited at 303K to 3.20 eV for film deposited at 403K corresponds to the fundamental energy gap (B-band)
Absorption and extinction coefficients of C60 thin films vary with wavelength and they increase with the increasing of substrate temperature
Summary
There is flexibility in synthesizing new molecules of organic semiconductors through inducing a change in the electronic properties of them by changing either the functional groups or atomic arrangement, and makes these organic semiconductors good candidates for optoelectronic applications [1].Iraqi Journal of Science, 2019, Vol 60, No.5, pp: 1006-1012Fullerenes molecules arrange at high symmetric sites. الرقيقة ضمن المدى المرئيC60 تأثبر درجة ح اررة الركيزة على الخصائص البصرية لأغشية . ضمن المدى المرئيC60 هذه الد ارسة على تأثير درجة ح اررة الركيزة على الخهاص البررية للأغذية الرقيقة
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