Charge carrier transport in indium oxide nanocrystals

Nanocrystalline indium oxide samples with various sizes of nanocrystals are synthesized by the sol-gel method. The minimal and maximal average sizes of nanocrystals are 7–8 and 18–20 nm, respectively. An analysis of conductivity measured at dc and ac signals in a wide temperature range ( T = 50–300 K) shows that the transport of charge carriers at high temperatures takes place over the conduction band, while in the low-temperature range, the hopping mechanism with a varying jump length over localized states is observed.