n-Type Conductivity of Cu2O Thin Film Prepared in Basic Aqueous Solution Under Hydrothermal Conditions
- 149 Downloads
We report for the first time in situ hydrothermal synthesis of n-type Cu2O thin film using strong alkaline solution. The use of copper foil as substrate and precursor material, low synthesis temperature and short reaction time represent the arguments of a new, simple, inexpensive and high field synthesis method for the preparation of n-type Cu2O thin film. The donor concentration of n-type Cu2O thin film obtained at 2 h of reaction time has increased two orders of magnitude than previous reported values. We have demonstrated n-type conduction in Cu2O thin film prepared in strong alkaline solution, in the contradiction with the previous works. Based on experimental results, the synthesis mechanism and the origin of n-type photo-responsive behavior of Cu2O thin film were discussed. We have proposed that the unexpected n-type character could be explained by H doping of Cu2O thin film in during of the hydrothermal synthesis that caused the p-to-n conductivity-type conversion. Also, this work raises new questions about the origin of n-type conduction in Cu2O thin film, the influence of the synthesis method on the nature of the intrinsic defects and the electrical conduction behavior.
Keywordsn-Type semiconductor Hydrothermal synthesis Cuprous oxide Intrinsic n-type defects
This work was supported by a grant of the Romanian National Authority for Scientific Research and Innovation, CNCS/CCCDI—UEFISCDI, Project No. PN-III-P2-2.1-PED-2016-0526, within PNCDI III.
- 34.Sander, T., Reindl, C.T., Giar, M., Eifert, B., Heinemann, M., Heiliger, C., Klar, P.J.: Correlation of intrinsic point defects and the Raman modes of cuprous oxide. Phys. Rev. B 90(045203), 1 (2014)Google Scholar
- 38.Subramanian, S., Valantina, R., Ramanathan, C.: Structural and electronic properties of CuO, CuO2 and Cu2O nanoclusters – a DFT approach. Mater. Sci. 21(2), 173 (2015)Google Scholar