Determination of the electronic parameters of nanostructure SnO2/p-Si diode
The currentvoltage and capacitancevoltage characteristics of the nanostructure SnO2/p-Si diode have been investigated. The optical band gap and microstructure properties of the SnO2 film were analyzed by optical absorption method and scanning electron microscopy, respectively. The optical band of the film was found to be 3.58eV with a direct optical transition. The scanning electron microcopy results show that the SnO2 film has the nanostructure. The ideality factor, barrier height and series resistance values of the nanostructure SnO2/p-Si diode were found to be 2.1, 0.87eV and 36.35k?, respectively. The barrier height obtained from CV measurement is higher than obtained from IV measurement and this discrepancy can be explained by introducing a spatial distribution of barrier heights due to barrier height inhomogeneities, which are available at the nanostructure SnO2/p-Si interface. The interface state density of the diode was determined by conductance technique and was found to be 8.411010eV?1cm?2. It is evaluated that the nanostructure of the SnO2 film has an important effect on the ideality factor, barrier height and interface state density parameters of SnO2/p-Si diode.
sno2 solgel spin coating heterojunction diode