Exploring the charge injection aptitude in pyrazol and oxazole derivatives by the first-principles approach

Azole derived products acquired significant consideration in everyday life based on their improved biological potential to the semiconducting substances. The research focused in-depth within pyrazol, and oxazole compounds 1–4 concerning charge transport, structural, optical as well as electronic properties. The density functional theory (DFT) along with time-dependent DFT were used for the optimization of their ground state geometries and excitation energies. We also investigated the molecule’s electron coupling constants (|V RP|) as well as electron injection (ΔG inject) values. For better understanding, charge transport and electronic characteristics were performed through quantum chemical computations. The |V RP| and ΔG inject values of pyrazole, as well as oxazole molecules, exhibited that these compounds could be competent for dye-sensitized solar cell applications. The pyrazole higher diagonal band gap enlightening these might have enhanced fill factor (FF) along with short-circuit current density (J sc ). We have also explored the electron injection, energy level offset, dissociation of excitons, and band alignment of studied compounds to shed light on the functionality of these compounds for photovoltaic and semiconductor device applications.

Synthesis, spectral characterizations, molecular geometries and electronic properties of phenothiazine based organic dyes for dye-sensitized solar cells

A number of organic dye compounds is developed and used as dye-sensitized solar cells in order to produce cost-effective devices and enhance cell performance. In this aspect, phenothiazine based organic dye compounds such as (E)-3-(7-bromo-10-phenyl-10H-phenothiazine-3-yl) acrylic acid and (E)-3-(7-bromo-10-phenyl-10H-phenothiazine-3-yl)-2-cyanoacrylic acid have been synthesized. The synthesized dye compounds have been characterized through Fourier-transform infrared, Fourier-transform Raman and nuclear magnetic resonance spectroscopic method. The Ultraviolet–Visible spectra were recorded and electronic features were discussed with the theoretically calculated bands using time-dependent density functional theory. Frontier molecular orbital, natural bond orbital and non-linear optical properties have been calculated for these compounds using density functional theory. The photosensitization properties such as light harvesting efficiency and electron injection driving force (∆G inject) have also been discussed.