Ponente
Descripción
Organic-based optoelectronic devices, as the organic solar cells (OSCs) have attracted considerable interest as a clean-energy alternative, due to its attractive feature of low-cost solution processing methods on flexible substrates. For over two materials employed in OSCs devices by its ability to accept and transport electrons in three dimensions, which facilitates electron delocalization at the donor-acceptor interfaces in bulk-heterojunction solar cells.1 We report a synthetic method to obtain a novel hybrid material with similar structure to PC61BM, from the reaction of suitably functionalized epiandrosterone with [60]fullerene. Therefore, we carried out the chemical transformation of epiandrosterone, in order to obtain a new malonate-steroid derivative. Employing the Bingel–Hirsch protocol, we describe a new mono-adduct steroid-methane[60]fullerene. It was observed by transmission electron microscopy that the monoadduct forms nanocrystals. These nanocrystals increase the efficiencies of photovoltaic devices, because they increase the electron affinity of fullerene derivatives in a range of ~100-200 mV.2 We study the redox properties of the fullerene derivative synthesized by cyclic voltammetry (CV), and it exhibits a better electron-acceptor ability than PC61BM. DFT calculations using the PBE functional was use to estimate the stability of a fullerene-thiophene oligomer used in the active layer of OSCs. The excited states energies and charge displacements of the C60 derivate-thiophene complex were modeled by CNDOL approximation together with configuration interaction of single excitations. According to the results obtained from cyclic voltammetry, transmission electron microscopy, thermogravimetric analysis and theoretical studies, the steroid-[60]fullerene synthesized material could be employed as potential electro-capturing material in photovoltaic devices.
