Electrical and photovoltaic properties of a n-Si/chitosan/Ag photodiode
The electrical and photovoltaic properties of AuSb/n-Si/chitosan/Ag diode have been investigated. The ideality factor, barrier height and Richardson constant values of the diode at room temperature were found to be 1.91, 0.88eV and 121.4A/cm2K2, respectively. The ideality factor of the diode is higher than unity, suggesting that the diode shows a non-ideal behaviour due to series resistance and barrier height inhomogeneities. The barrier height and ideality factor values of Ag/CHT/n-Si diode at room temperature are significantly larger than that of the conventional Ag/n-Si Schottky diode. The ?B value obtained from CV measurement is higher than that of ?B value obtained from IV measurement. The discrepancy between ?B(CV) and ?B(IV) barrier height values can be explained by Schottky barrier height inhomogeneities. AuSb/n-Si/chitosan/Ag diode indicates a photovoltaic behaviour with open circuit voltage (Voc=0.23V) and short-circuit current density (Jsc=0.10?A/cm?2) values.
barrier height inhomogeneity photovoltaic behaviour organic semiconductor