EFFECT OF ANNEALING TEMPERATURE ON THE ELECTRICAL PROPERTIES OF TITANIUM DIOXIDE (TiO2) - ROSELLE DYE SENSITIZED SOLAR CELL.

A Titanium Dioxide-Roselle Dye sensitized solar cell with a dimension of 20 x 20 mm was fabricated using Doctor-Blade Method. Some of the samples were given annealing treatment at various temperatures of 2500C, 3000C, 3500C, 4000C and 4500C respectively with same annealing time of 30min. The device under test (DUT) were tested using a Kiethley 2400, source meter under A.M 1.5 (1000W/m2) illumination from a Newport class A solar simulator. The results shows that at the various annealing temperatures, the open circuit voltage Voc= 0.091V, 0.79V, 0.78, 0.93 and 0.46V, the short circuit current density Jsc=42µAcm-2 , 16µAcm-2, 109µAcm-2, 505µAcm-2 and 8µAcm-2, the fill factor FF= 0.15, 0.06, 0.03, 0.02 and 0.14 and the energy conversion efficiency, ? = 6 x10-4, 8 x10-4, 2 x10-3, 6 x10-3 and 5 x10-4 respectively. The best results of open circuit voltage Voc=0.93, short circuit current density Jsc= 505µAcm-2, fill factor FF= 0.02 and energy conversion efficiency ?= 6 x10-3 was at temperature T= 4000C at constant annealing time, t =30 minute compared to the other four samples annealed at temperatures 2500C, 3000C, 3500C and 4500C. These results shows that at temperature T= 4000C the annealing treatment shows some effects on the electrical properties of the TiO2-Roselle Dye Sensitized solar Cell produced.