Estudio de propiedades ópticas de películas de compuesto de tipo oligofenileminas conjugadas con aplicaciones en celdas solares orgánicas

Armando I. Martínez; Aaron  Jardines; Alberto  Gamero; Mario  Quezada; Fernando González; Rosa A.  Vázquez; Esteban  Rueda; Karina  Alemán

doi:10.29057/aactm.v1i1.9970

Armando I. Martínez Universidad Autónoma del Estado de Hidalgo https://orcid.org/0000-0002-9252-1043
Aaron Jardines Universidad Autónoma del Estado de Hidalgo
Alberto Gamero Universidad Autónoma del Estado de Hidalgo
Mario Quezada Universidad Autónoma del Estado de Hidalgo
Fernando González Universidad Politécnica de Pachuca
Rosa A. Vázquez Universidad Autónoma del Estado de Hidalgo https://orcid.org/0000-0001-6522-9859
Esteban Rueda Universidad Autónoma del Estado de Hidalgo https://orcid.org/0000-0002-5430-2536
Karina Alemán Universidad Autónoma del Estado de Hidalgo https://orcid.org/0000-0001-6716-7049

DOI: https://doi.org/10.29057/aactm.v1i1.9970

Keywords: Oligophenylemines, Organic solar cells, Optical properties.

Abstract

The study of the optical properties of films of conjugated oligophenylenimine-type compounds (OIC) obtained by the mechanosynthesis route is reported. This process was carried out in a high-energy mill in the absence of solvents and catalysts for a period of 90 minutes. Once the compound was obtained in solid state, different solvents were added to obtain a solution and with it, deposit it on substrates. The result of these deposits were thin films on glass substrates that were achieved by means of the spin coating technique, through this process film thicknesses between 100 and 150 nm were obtained. Transmittance measurements T(%) were made in the range from 120 to 1100 nm and the absorption coefficient α (hν) was calculated as a function of photon energy. The amorphous behavior of the material allowed the study to be carried out considering an exponential decay with tails in the density of states (DOS) distribution; to calculate parameters such as the defect absorption coefficient αD(hν), the Urbach EU energy and the material's forbidden band or optical gap Eg. The data for the thin films made with the mixture of OIC and different solvents were discussed and it was found that the best film with possible applications in solar cells was using tetrahydrofuran as solvent, reporting an Urbach energy of EU= 0.2eV and an optical gap of Eu=2.7 eV.

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