Synthesis of the p-Type Semiconductor CuAlO2
https://doi.org/10.1134/S2304487X19050043
Abstract
CuAlO2 is an important material having diverse applications in thermoelectricity, photoelectricity, and optoelectronics. Most of the well-known and widely used transparent conducting oxides such as ZnO and SnO2 and their doped versions are n-type material, but corresponding p-type transparent conducting oxides were surprisingly missing for a long time. Its unique crystallographic structure manifests an anisotropic environment for charge carriers and phonons, which is a reason for the enhancement of the thermopower. The scheme for the sol–gel synthesis of nanocrystalline powders CuAlO2 has been presented in this work. It has been found that the energy released by the combustion of citric acid in the process of synthesis is “extra fuel,” which allows overcoming the energy barrier of the reaction. X-ray diffraction analysis and simultaneous thermal and electron-microscopic analyzes have been used to demonstrate the possibility of copper aluminate synthesis with a delafossite structure at a temperature of 1000 °C. It has been established that the heating mode significantly affects the phase composition of the final product: with the gradual heating, copper aluminate with a spinel structure is formed, and with the sharp heating, delafossite is formed. The scanning electron microscopy studies have also shown that the typical particle sizes in copper aluminate samples calcined at 1000 °C are 35 nm. The temperature dependence of conductivity has been measured and activation energy has been determined.
About the Authors
A. G. Makogon
Chelyabinsk State University
Russian Federation
Russian Federation
454021
Chelyabinsk
E. A. Belaya
Chelyabinsk State University
Russian Federation
Russian Federation
454021
Chelyabinsk
A. Kolmogortsev
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)
Russian Federation
Russian Federation
115409
Moscow
V. V. Viktorov
South Ural State Humanitarian Pedagogical University
Russian Federation
Russian Federation
454080
Chelyabinsk
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Review
For citations:
Makogon A.G., Belaya E.A., Kolmogortsev A., Viktorov V.V. Synthesis of the p-Type Semiconductor CuAlO2. Vestnik natsional'nogo issledovatel'skogo yadernogo universiteta "MIFI". 2019;8(5):410-414. (In Russ.) https://doi.org/10.1134/S2304487X19050043
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