(1. School of Electrical Engineering, Shanghai Dianji University, Shanghai 201306, China) (2. School of Physics and Electronic Science，East China Normal University，Shanghai 200241，China) (3. School of Materials，Shanghai Dianji University，Shanghai 201306，China)
Ternary oxide delafossite CuMO2 is a p-type wide bandgap semiconductor with excellent optical and electrical properties. The CuMO2 materials have high transparency in the visible and nearinfrared regions, while the properties of ultraviolet-cutoff and good conductivity. The properties and four chemical synthesis methods (sol-gel method, hydrothermal synthesis, electrostatic spinning technology, and polymer-assisted-deposition method) of CuMO2 materials are reviewed in this paper. The research progress and properties of CuMO2 devices applied in the ultraviolet detector, perovskite solar cells, and thin film transistors are introduced in detail. These studies show that the ternary oxide CuMO2 is very promising to be used in low cost, high efficiency, good stability of photoelectric devices and p-type thin film transistors, and its performance research and device exploration have great potential. However, the synthesis temperature of its thin films is high at present. The electrical properties of the lowdimensional delafossite materials need to be further improved. Therefore, the research, development and application of delafossite-based optoelectronic devices is both a challenge and an opportunity.