Title : Synthesis of semiconductor pigment materials and their application in obtaining new generation solar cells
Abstract:
Background: One of the most effective solutions to today's energy problems is the use of solar energy. It is important to create cheap and promising solar cells based on organic semiconductor materials.
Purpose: The purpose of this research work is to synthesize a semiconducting polymer dye pigment used as a dye pigment for dye-sensitized solar cells and to study its physicochemical, as well as volt-amper, optical and semiconducting properties.
Methodology: In our research work, we used UV spectroscopy and analytical data measured on digital multimeters Щ300 and DT 9205A to study the optical and semiconducting properties of the newly synthesized cobalt-containing phthalocyanine pigment.
Originality: For the first time, a cobalt-containing phthalocyanine dye pigment was applied in solution to dye-sensitized solar cells. The optical and semiconducting properties, as well as the current and voltage values, were studied for 15 days.
Findings: A complex compound [C32H16CoN8] consisting of phthalic anhydride, cobalt disulfate salt, urea, and ammonium heptamolybdate was synthesized and its optical and semiconductor properties were studied using physicochemical methods.
Currently, the semiconducting properties of metal phthalocyanines are being used to create new generation solar cells, to obtain energy harvesting materials, as well as to obtain materials used in devices for determining the sensitivity of phthalocyanine-based gas sensors. Complexes that actively absorb electromagnetic radiation in the visible and near-infrared range from phthalocyanines can be used to create complex semiconductor structures that combine the properties of organic and inorganic semiconductors.
The electron transition between HOMO and LUMO orbitals, i.e., the direction of movement of excited electrons along the zones, is determined by the metal on the central atom and the substituent radical molecules at the edges of the phthalocyanine ring. The electronic transition between these states creates two excited states. The molecular groups on the metal and the ligands on the edges of the central atom affect the HOMO and LUMO transition energies. Such approaches are used in the physics and chemistry of phthalocyanines to describe their semiconducting and photosensitizing properties.
The optical absorption peaks of the obtained dye showed characteristic peaks with a high assimilation level in the range of 700-800 nm and a low assimilation level in the range of 500-600 nm. The remarkable chemical and photophysical properties of phthalocyanines are due to their multi-electron system. The band of strong optical absorption peaks is due to the transition of p-p electrons from the ground state to the HOMO and excited state LUMO energy levels.
