Comparative study of the structural and optical properties of epitaxial CuFeO2 and CuFe1−xGaxO2 delafossite thin films grown by pulsed laser deposition methods

Temperature-dependent optical properties of CuFeO2 through the structural phase transition

“…The absorption peaks at approximately 3.70, 4.33, and 5.06 eV were associated with the charge-transfer transitions from the 2p orbital of oxygen to the 3d orbital of copper or iron. 20 In a normal solid, the optical absorption coefficient α ( E ) includes contributions from both direct and indirect band gap transitions. 34 The optical absorption coefficient is given by where E g,dir and E g,ind are the magnitudes of the direct and indirect gaps, respectively; E ph is the emitted (absorbed) phonon energy; and A and B are constants.…”

“…Our result is similar to that of previous UV-Vis absorption spectrum analyses and theoretical calculations. [18][19][20] To conrm that the CuFeO 2 single crystal is a direct band gap material, Fig. S4 † presents the room temperature photoluminescence spectrum of CuFeO 2 determined using a 325 nm excitation laser.…”

“…Using transmittance and diffuse reflectance spectra, they found a direct band gap of approximately 1.3 to 1.4 eV at room temperature. Roble et al 20 presented the room temperature diffuse reflectance spectroscopy of bulk 3R–CuFeO 2 . They found a direct band gap of approximately 1.3 eV.…”

A numerical study on delafossite CuFeO2 as an absorber for efficient and sustainable oxide solar cells

“…The data used in the simulation are given in Table I, which were selected from previous experimental and theoretical studies. [36][37][38][39][40][41][42][43] Figure 2 represents the simulated band diagram from the proposed structure. Band alignment is critical for efficient charge transport and extraction.…”

Microstructural and transport properties of Mg doped CuFeO2 thin films: A promising material for high accuracy miniaturized temperature sensors based on the Seebeck effect

“…CuFe02 has given rise to renewed interest in the recent years due to its photocatalytic properties for hydrogen production (17,(25)(26)(27) as well as photovoltaic (28] properties. Few authors have prepared this CuFeOz material in thin film form using different deposition techniques such as pulsed laser deposition (29)(30)(31)(32), radio frequency sputtering (33,34 ], spin coating (35)(36)(37), electrodeposition (38] and spray pyrolysis (39 ]. In addition, the thermoelectric behavior of doped or undoped CuFe0 2 was rarely studied on thin films.…”