Impact of producing way nanocrystalline Tio2 layer on the efficiency of photovoltaic cells : bachelor thesis

U radu je ispitivana efikasnost fotonaponskih ćelija pripravljenih na osnovi nanokristaličnog TiO2, uz različitu viskoznost paste i debljine nanesenog tankog sloja TiO2 na staklu. Također ispitivani su različiti načini sušenja i pečenja nanesenog nanokristaličnog TiO2 sloja te je određen prihvatljiv način priprave uz odgovarajuće vrijeme sušenja i temperaturu pečenja TiO2 filma. Kompaktnost sloja provjeravana je optičkim mikroskopom, a njegova mehanička otpornost provjeravana je metalnom špatulom. Dio stakalaca s pripravljenim nanokristaličnim TiO2 filmovima uronjen je 5 sekundi u fotoosjetljivo organsko bojilo ekstrahirano etanolom iz suhog cvijeta hibiskusa, a ostala stakalca ostavljena su 30 minuta u fotoosjetljivom bojilu. Inducirani fotonapon je mjeren sedam dana te je na osnovi dobivenih vrijednosti zaključeno o efikasnosti fotonaponskih ćelija. Najveću vrijednost induciranog fotonapona dale su fotoćelije pripravljene uz tanki sloj nanokristaličnog TiO2 iz paste manje viskoznosti s kratkim uranjanjem u fotoosjetljivo bojilo te zagrijavanjem u laboratorijskoj peći od sobne temperature do 400 °C uz brzinu zagrijavanja od 10 °C min-1.The paper examined the efficiency of photovoltaic cells prepared based with nanocrystalline TiO2, with different viscosity of the paste and the thickness applied a thin layer of the TiO2 on glass. It was eamined different wayes of drying and firing the applied nanocrystalline TiO2 layer and is determined acceptable way of preparation with adequate drying time and firing temperature of TiO2 film. Compactnesss of layers were examined by optical microscope, and its mechanical resistance checked with a metal spatula. Part of slides with prepared nanocrystalline TiO2 films were immersed for five seconds in a photosensitive organic dye extract with ethanol from dry flowers of hibiscus and other slides were left 30 minutes in the photosensitive dye. Induced photovoltaics is measured for seven days and on the basis of the obtained values the efficiency of photovoltaic cells was determined. The highest values of the induced photovoltaic photocells are provided made with a thin layer TiO2 nanocrytsalline with lower viscosity of the paste with a short dip in the photosensitive dye and the laboratory furnace by heating from room temperature to 400 oC at a heating rate of 10 oC min-1