Salas Rincón, Ricardo Andrés

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    Novel polymer donors and small molecule acceptors in organic photovoltaic devices for wearable technologies
    (2023-09-06) Salas Rincón, Ricardo Andrés; Suleiman Rosado, David; College of Engineering; Padovani Blanco, Agnes M.; Saliceti Piazza, Lorenzo; Ortiz Rivera, Eduardo I.; Department of Chemical Engineering; Acuña Guzmán, Salvador F.
    Organic photovoltaics represent a very suitable alternative to develop cheap, flexible, versatile, and lightweight solar cells with reasonable efficiencies and good installation efficacy. Herein, several single-junction organic photovoltaic devices were manufactured with the main purpose of studying the mechanisms involved in the light harvesting and charge generation and transport processes. Alternating copolymer donor PM6 was used in a bulk heterojunction architecture with the non-fullerene acceptor (NFA) Y6. Also, a new random terpolymer was synthesized by adding a cyclopentadithiophene unit (CPDT) to the PM6 structure. The resulting donor material, called PM6-CPDT, was paired with the same acceptor and new devices were fabricated with the blend. The characterization of the new donor material, including FT-IR, UV-Vis, cyclic voltammetry, TGA, and AFM, showed a close similarity with PM6. Four different individual types of active layer blends, based on the statistical combinations of the two polymer donors with Y6 and with donor:acceptor mass blend ratios of 1:1.2 and 1.2:1 was used to fabricate the devices. The characterization of the devices consisted of applying separately, under 6000 lx of illumination and under the dark, a forward bias from -1 to 1.5 V and recording the current densities generated, and it showed no specific relationship between the type of active layer employed and the current generated by the photovoltaic layouts. Among all devices the maximum value of current density of 334 μA/cm2 was achieved with the PM6-CPDT:Y6 1:1.2 blend under illumination and 25.6 μA/cm2 under the dark, demonstrating a photovoltaic behavior on the cells. The nature of the results led us to conclude that stronger illumination and light intensity could achieve J-V curves that should allow calculations of the performance parameters such as short-circuit current density, open circuit voltage, and efficiency of the solar cells, which will be left for future works.