Abstract
Thin films of CuPc of various thicknesses (150,300 and 450) nm have been deposited using pulsed laser deposition technique at room temperature. The study showed that the spectra of the optical absorption of the thin films of the CuPc are two bands of absorption one in the visible region at about 635 nm, referred to as Q-band, and the second in ultra-violet region where B-band is located at 330 nm. CuPc thin films were found to have direct band gap with values around (1.81 and 3.14 (eV respectively. The vibrational studies were carried out using Fourier transform infrared spectroscopy (FT-IR). Finally, From open and closed aperture Z-scan data non-linear absorption coefficient and non-linear refractive index have been calculated respectively using He-Ne laser which have beam waist of (24.2 μm), wave-length of (632.8 nm) and Rayleigh thickness was 2.9 mm.
Highlights
In recent years, significant research efforts have been devoted to the characterization and fabrication of various organic semiconductor thin films
The first one is in the UV phase, and named the band referred to as Soret band (B-band) (Soret) at 330 nm, while the other is in the visible region, 605 – 670 nm wavelength range, namely the Q band
Thin films were manufactured from CuPc by pulsed laser deposition on substrates with different thicknesses; it has found that there are B and Q bands observations in the UV-Vis. absorption spectra of films prepared with different thickness
Summary
Significant research efforts have been devoted to the characterization and fabrication of various organic semiconductor thin films. Throughout this work of investigation, the Z-Scan method was used for measuring both non-linear coefficients of absorption β and the index of the nonlinear material refraction n2.
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