Celdas Grätzel de TiO2 sensibilizadas con el colorante natural Ayrampo (Opuntia Soehrensii), usando grafito como contraelectrodo

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Jara Caytuiro, Fabiola
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Universidad Nacional de Ingeniería
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For new dyes that make feasible the manufacture in large-scale solar cells sensitized with dyes, materials that are more economical compared to conventional materials which are produced only in laboratories seek. As an application of nanotechnology is known is convection solar energy into electrical energy using photovoltaic technology, as nanomaterials and / or films with thicknesses in the nanometer scale are used, but looking for new dyes, this paper research using own natural dyes of our country, this paper aims was studied to ayrampo (Opuntia soehrensii) dye only known for its culinary and medicinal use for its antioxidant properties, but now will use as a sensitizer in of the Grätzel cell, these cells are made up of superimposed layers, each has a decisive and specific function, being the dye responsible for absorbing photons and convert them into electrons, having a great importance in the open circuit voltage and the cell efficiency. The semiconductor is a nanoporous layer synthesized on a conductive FTO substrate, whose thickness is in the micrometer scale , then this semiconductor sensitized with the dye, for which the semiconductor is impregnated by the natural dye (ayrampo). The counter electrode is a graphite layer on the FTO electrode join the counterelectrode by fasteners and between the electrolyte is placed. electrodes prepared by the doctor blade method were then sintered, its thickness was characterized by profilometry to determine its thickness, and then be sensitized with ayrampo. These pigmented films were characterized by FTIR, to find the types of bonds present. The cells were characterized with its current versus voltage curve to determine FF, ISC, VOC, VPMM, IPMM and efficiency of the solar cell. the characterization of the cell impedance to observe their internal behavior was also performed. The principle of operation of the cell is given by the photovoltaic effect, when solar radiation falls on the cell, the photon strikes the dye molecule, this gives you enough to excite energy and make the electron can escape the molecule dye and move to the semiconductor, when this occurs, a flow of electrons (e-) is created. Then the liquid electrolyte iodide / Tri-Iodide I-/I-3) regenerates the dye with one of their own electrons, electrons travel and create an electrical circuit. I-V curve shows that the solar cell has maximum efficiency at 0.75%.
Al Dr. Walter Estrada López por conferir facilidades para el grupo de investigación. A las personas que buscan un desarrollo científico en el país (CONCYTEC), gracias por brindar esta oportunidad para realizar investigación de modo que la ciencia tenga una contribución en el progreso y desarrollo de nuestro país, ya que la única manera que progrese el país es con trabajo y estudio.
Palabras clave
Semiconductores, Celdas solares sensibilizadas, Nanotecnología