Temperature effects on the electrical characteristics of $\mathrm{Al}/\mathrm{PTh}-\mathrm{SiO}_{2}/\mathrm{p\hbox {-}Si}$ structure

Abstract

The temperature-dependent current–voltage ($I\text {--}V$) and capacitance–voltage ($C\text {--}V$) characteristics of the fabricated Al/p-Si Schottky diodes with the polythiopene–SiO$_{2}$ nanocomposite ($\hbox {PTh--SiO}_{2}$) interlayer were investigated. The ideality factor of $\hbox {Al}/\hbox {PTh--SiO}_{2}/{p}\text {-Si}$ Schottky diodes has decreased with increasing temperature and the barrier height has increased with increasing temperature. The change in the barrier height and ideality factor values with temperature was attributed to inhomogeneties of the zero-bias barrier height. Richardson plot has exhibited curved behaviour due to temperature dependence of barrier height. The activation energy and effective Richardson constant were calculated as 0.16 eV and $1.79 \times 10^{-8} \hbox {A\,cm}^{-2} \,\hbox {K}^{-2}$ from linear part of Richardson plots, respectively. The barrier height values determined from capacitance–voltage–temperature ($C\text {--}V\text {--}T$) measurements decrease with increasing temperature on the contrary of barrier height values obtained from $I\text {--}V\text {--}T$ measurements.