Theoretical Study of Electronic Transfer Current Rate at Dye-Sensitized Solar Cells

In this research, we present a theoretical study of electronic transfer kinetics rate in N719/TiO2 and N719/ZnO dye-sensitized solar cells (DSSC) systems using a simple model depending on the postulate of quantum mechanics theory. The evaluation of the electronic transition current rate in DSSC systems are function of many parameters such that;the reorientation transition energies Lambda(Dye)(sem), the transition coupling parameter C-T (0),potential exponential effect e(E-c-E-F)k(B)T, unit cell volume V-sem,and temperature T. Furthermore,the analysis of electronic transfer current rate in N719/TiO2 and N719/ZnO systems show that the rate upon dye-sensitization solar cell increases with increases of transition coupling parameter,decreasing potential that building at interface a results of different material in this devices and increasing with reorientation transition energy. On the other hand,we can find the electronic transfer behavior is dependent of the dye absorption spectrum and mainly depending on the reorientation of transition energy. The replacement of the solvents in both DSSC system caused increasing of current rates dramatically depending on polarity of solvent in subset devices. This change in current rate of electron transfer were attributed to much more available of recombination sites introduced by the solvents medium. The electronic transfer current dynamics are shown to occurs in N719/TiO2 system faster many time compare to ocuures at N719/ZnO system,this indicate that TiO2 a is a good and active material compare with ZnO to using in dye sensitized solar cell devices. In contrast,the large current rate in N719/TiO2 comparing to ZnO of N719/ZnO systems indicate that using TiO2 with N719 dye lead to increasing the efficiency of DSSC.