Activity assesment of photosensitive dyes antocyanin, rhodamine B and methyl blue for application in solar cells : diploma thesis

U radu je ispitivana aktivnost fotoosjetljivih bojila antocijanina, rhodamina B i metil plavog te njihovih smjesa za primjenu u solarnim ćelijama na osnovi nanostrukturiranih poroznih slojeva TiO 2 i ZnO. Antocijanin je ekstrahiran u etanolu iz suhog cvijeta hibiskusa (lat. Hibiscus sabdariffa), a rhodamin B i metil plavo su komercijalne kemikalije. Određeni su UV - Vis spektri ekstrahiranog antocijanina i odabranih kombinacija bojila (rhodamin B + metil plavo te antocijanin + rhodamin B + metil plavo). Radi dobivanja kompaktnog nanokristaličnog oksidnog sloja na fotoanodi solarne ćelije priprava pasti od nanočestica TiO 2 i ZnO provedena je na isti način uz dodatak neionskog disperganta Triton - X 100 te PEG - a i razrijeđene octene kiseline do potrebne konzistencije paste. Fotoanode su pripravljene nanošenjem oksidnog sloja na osnovi nanočestica TiO 2 i ZnO, a potom su sušene u sušioniku 20 minuta, te pečene u peći 40 minuta. Na vodljivu stranu stakalaca za katode solarnih ćelija naprskavanjem je nanesen sloj grafita, a potom su katode sušene 30 minuta radi uklanjanja organskog otapala. Radi usporedbe učinkovitosti pojedinih solarnih ćelija mjeren je fotoinducirani napon pri umjetnom osvjetljenju i pri sunčevoj svjetlosti te je zaključeno koja su bojila ili smjesa bojila prikladna za izradu fotonaponskih ćelija.In this paper the activity of photosensitive dyes of anthocyanin, rhodamine B and methyl blue and their mixtures was analized for use in solar cells based on nanostructured porous TiO 2 and ZnO layers. The anthocyanin was extracted into ethanol from a dry hibiscus flower (lat. Hibiscus sabdariffa), and rhodamine B and methyl blue are commercial chemicals. UV - Vis spectra of extracted anthocyanin and selected dye combinations (rhodamine B + methyl blue and anthocyanin + rhodamine B + methyl blue) were determined. To obtain a compact nanocrystalline oxide layer on the photoanode of the solar cell, the preparation of nanocrystalline TiO 2 and ZnO was carried out in the same manner with the addition of nonionic dispersion of Triton - X 100 and PEG and dilute acetic acid to the required paste consistency. Photoanodes were prepared by applying an oxide layer based on TiO 2 and ZnO nanoparticles and the photoanodes were dried in drier for 20 minutes and baked in furnace for 40 minutes. The graphite layer was applied to the conductive side of solar cells by spraying and the cathodes were dried for 30 minutes to remove the organic solvent. For comparison of the efficiency of individual solar cells, photo-induced voltage was measured in artificial light and in the sunlight, and it was concluded which dyes or dye combinations are suitable for photovoltaic cells