Synthesis and characterization of MINA-type compounds obtained by the mechanosynthesis route for applications in optoelectronics

Abstract

There is currently interest in developing organic semiconductors for their optical, electrical and mechanical properties to be applied in the area of optoelectronics, mainly for the manufacture of solar cells, emitting diodes organic light, thin film transistors (TTFs), smart windows, etc. In this work the production of organic semiconductor compounds imine is presented through mechanosynthesis path by using a high energy mill. The structural elucidation of the compound was performed by ¹H NMR. The study of the optical properties by applying a heat treatment was performed by UV-Vis spectroscopy, four solutions were prepared using the compound synthesized in different solvents (chloroform (CHCl₃), dichloromethane (CH₂Cl₂), tetrahydrofuran (THF) and methanol (CH₃OH)) at a concentration of 1mg/25mL. Subsequently films were deposited on glass substrates using the spin coating technique; the thickness of the films was about 120nm. Then the optical properties in film were obtained by acquiring absorbance curves depending on the wavelength and the maximum absorption length and the band in which the material exhibits optical activity was calculated. Finally heat treatment to the deposited films on the substrates was made and again the optical absorption spectrum was measured, attempted to determine if the temperature induced significant changes in the molecular structure of the material. It was observed that in the temperature range study films no significant change is observed when performing heat treatment, thereby reporting high thermal stability of the materials. The results suggest that the films obtained using CDCl₃ and CH₂Cl₂ are showing greater thermal stability reaching withstand temperatures of 150 °C, showing no changes in the spectrum absorption, indicating that it is possible to heat treatment as required to manufacture optoelectronic devices.