Nuevos oligómeros de tienilenvinileno: síntesis, caracterización y propiedades electrónicas

La tesis está basada en la síntesis, caracterización y estudio de las propiedades electrónicas de nuevos materiales orgánicos, para una posible aplicación en el diseño de dispositivos fotovoltáicos. Los compuestos objeto de estudio se pueden dividir en dos grupos diferentes: a) Nuevos derivados de fullereno que incorporen fragmentos electrodonadores y fragmentos electroaceptores conectados por cables moleculares, como por ejemplo oligomeros de diferentes longitudes derivados de tienilvinileno. b) Oligomeros que incorporen diferentes unidades de 3,4-etineldioxitiofeno (EDOT) conjugadas con el fin de estudiar sus propiedades electrónicas con objeto de ser utilizados en la síntesis de nuevos colorantes orgánicos utilizados en el diseño de células solares de tercera generación

Effect of the bridge substitution on the efficiency of dye-sensitized solar cells

We have designed and synthesized a novel D–π–A dye based on zinc porphyrin as the donor, cyanoacrylic acid as the acceptor and trans-bis(3,4-ethylenedioxythiophene)vinylene as the bridge. Under standard global AM 1.5 solar conditions, the Zn-porphyrin-2-EDOT sensitizer based cell gave a JSC of 7.28 mA cm−2, VOC of 0.438 V was obtained with a FF of 0.514, corresponding to an overall conversion efficiency η = 1.64%. The reasons for this low efficiency are analyzed to try to develop knowledge for future dye designing

High Photocurrent in Oligo-thienylenevinylene Based Small Molecule Solar Cells Having 4.9% Solar-to-Electrical Energy Conversion

A set of five novel oligo-thienylenevinylene organic molecules have been synthesized and characterized for use as electron donor moieties in bulk-heterojunction solution-processed organic solar cells combined with PC71BM as an electron acceptor. The results show a broad range of solar-to-electrical conversion efficiencies, with values up to 4.9% achieved with a photocurrent value as high as 12 mA cm&minus;2&nbsp;under standard measurement conditions. Moreover, another aim of this study was to determine the main limiting processes that control the final performance parameters of these devices. Photo-induced charge transfer measurements, such as charge extraction (CE), Transient Photo-Voltage (TPV) and mobility measurements, were carried out in order to determine the main loss mechanisms and to correlate them with the electron donor molecular design. &nbsp;</div

High open circuit voltage in efficient thiophene-based small molecule solution processed organic solar cells

International audienceWe have synthesized and fully characterized an oligothiophene small organic molecule for its use as electron donor moiety in solution processed bulk-heterojunction organic solar cells. Our results show that device solvent annealing process of the conjugated oligothiophene molecule leads to a light-to-energy conversion efficiency of 3.75% under standard illumination conditions. The solar cell presents open-circuit voltage and fill factors as high as 1.01 V and 63.05% respectively, which are among the highest values obtained for small molecule solution processed organic solar cells