A review on the p-type transparent Cu–Cr–O delafossite materials

Abstract

Transparent conductive oxides (TCOs) constitute a class of materials that combine high electrical conductivity and optical transparency. These features led to the development of the transparent electronics applications, such as flat panel displays, “smart” windows or functional glasses. N-type TCOs dominate the applications market, and the lack of a suitable p-type counterpart limits the fabrication of a completely transparent active device, which might be considered as a technological breakthrough. Among the wide range of p-type candidates, delafossite CuCrO2 (and its out-of-stoichiometry derivatives) is a promising material to achieve the desired p-type TCO properties as, up to date, it is presenting the foremost trade-off between optical and electrical properties. The present paper covers the research work and the major achievements related to copper chromium delafossite. A comprehensive overview of fabrication methods and opto-electronic properties is presented. The source of doping and the charge carriers transport mechanism are also thoroughly discussed. Graphical abstract

Metastability and Photoelectrochemical Properties of Cu2SnO3 and Cu2–xLixTiO3: Two Cu(I)-Based Oxides with Delafossite Structures

“…For example, 5% Mg doping into CuCrO 2 has been shown to increase its conductivity by 2 orders of magnitude. 43 Optical Band Gap and Band Edge Energies. The optical band gaps for I and II were measured via UV−vis diffuse reflectance spectroscopy.…”

Study of Gallium-Doped Zinc Oxide Thin Films Processed by Atomic Layer Deposition and RF Magnetron Sputtering for Transparent Antenna Applications

“…They are used in a wide range of applications including low-emissivity windows, optoelectronic devices, transparent contacts for solar cells, touch screens, flat panel displays, architectural smart glasses, and electromagnetic shielding devices . Although, lately, the p-type TCOs have started to be developed and thoroughly studied, − the market is dominated by the n-type materials. The most widely used now is the indium tin oxide with electrical conductivities and visible transparency beyond 3000 S/cm and 90%, respectively.…”

Hybridized Ag-CuCrO2 Nanostructured Composites for Enhanced Gas Sensing

“…Cu–Cr–O composite oxides have been regarded as a sort of versatile functional materials widely applied in the oxidation reaction catalysts, especially in industrial chemical processes . The crystal structure, phase composition, average size, and shape of particles in Cu–Cr–O composite systems are directly relevant to their catalytic performance . Therefore, it is of great importance to investigate a method for controlling surface morphology in a Cu–Cr–O system.…”

“…1 The crystal structure, phase composition, average size, and shape of particles in Cu−Cr−O composite systems are directly relevant to their catalytic performance. 2 Therefore, it is of great importance to investigate a method for controlling surface morphology in a Cu−Cr−O system. Currently, Cu-based delafossites with the general formula CuB III O 2 and space group R3̅ m or P6 3 /mmc have been extensively studied in various fields, 3−6 due to the particular crystal structure in which Cu + layers and BO 2 octahedral layers alternately stack along the caxis.…”