Novel Insights into the optical Properties of Poly (3-Hexylthiophene-co-Thiophene) with Varying Monomer Percentages
DOI:
https://doi.org/10.56714/bjrs.50.2.9Keywords:
Poly 3-hexylthiophene, Poly Thiophene, copolymerization, structure-property relationships, optical propertiesAbstract
The study explains the effect of the copolymer overlay ratio on optical properties that can be utilized in solar cell applications. Copolymers prepared by additive polymerization were characterized. The X-ray examination results characterized the samples and showed that the prepared samples of pure and composite polymers possess a high degree of crystallinity. The prepared samples were also characterized by FT-IR spectroscopy, which showed that these films had clear active groups. The optical properties of all prepared films were also studied, such as absorbance within the spectrum range (200 - 800 nm) as a function of wavelength, and Band gab Energy Eg, Excitation Energy Eo, Dispersion Energy Ed, Refractive index (no) 2, Dielectric constant at high frequencies E∞, Moments of The Optical Spectra for Crystal M-1 M-3, The Average Oscillator So, Third-order visual effect X^3. The study showed that the absorbance spectrum of the films of the materials under study is within the visible spectrum region, where the most significant peak was recorded for the pure and composite polymers at the wavelength of 485 - 495 nm. The study showed that the optical energy gap of P3HT polymer (2.78 eV) and for Thiophene (2.3 eV) and the value of the gap decreased with the doping rate increased until it reached (1.88 eV) at the copolymer rate of 70 % P3HT 30% thiophene. It showed varying thicknesses ranging from approximately 49.1 to 10.2 nanometers, and the recorded roughness of the polymer surfaces ranged from 20.7 to 5.19 nanometers
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