Síntese e caracterização de Yariv modificado e de nanopartículas de ouro para aplicação em dispositivos fotovoltaicos

Abstract

The main objective of this work was to synthesize and characterize the Yariv reagent. This has been modified to make it soluble in nonpolar solvent and a better electron donor. Gold nanoparticles (AuNP's) were also synthesized from a seed and growth solution. For the characterization, the techniques of Spectroscopy in the Ultraviolet-Visible region (UV-Vis), X-Ray Diffraction (XRD), Photoluminescence (PL), Time Resolution Photoluminescence (PLRT), Quantum Photoluminescence Efficiency (PLQY). and Nuclear Magnetic Resonance (NMR). A computational method was also used, with the purpose of comparison, to contrast the characterizations. A future use of the compound for the active layer in a photovoltaic device was sought, together with the polymer Poly[(9,9-dioctyl-fluorenyl-2,7-diyl)-co-(1,4-benzo[2, 1,3]-thiadiazole)] F8BT and AuNP's. The gold’s nanoparticles were formed by changing the morphology (nanospheres and nanorods) given the concentration of silver nitrate (AgNO3) added in the particle growth phase, with an average crystallite size of 15 nm. Plasmonic resonance has been shown to occur when inserted into PEDOT:PSS solution. The calculated value of the HOMO-LUMO gap for the Yariv molecules was 3.87 eV for the neutral and 3,76 eV for the electron donor. The energy transfer efficiency calculation showed a transfer efficiency of 34,1% from F8BT to Yariv. Thus, the synthesis and characterization of the Yariv Neutral and Electron-donor reagent obtained the expected result, enabling its purpose of use in the active layer of a hybrid optoelectronic device.