X-ray spectroscopic studies of the electronic structure of chromium-based<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>p</mml:mi></mml:math>-type transparent conducting oxides

Norton, Emma; Farrell, L.; Callaghan, Stephen D.; McGuinness, Cormac; Shvets, I. V.; Fleischer, K.

doi:10.1103/physrevb.93.115302

Cited by 16 publications

(7 citation statements)

References 49 publications

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“…In the second case, the thermal energy activates the small polarons and σ can be expressed as Equation (3). CuCrO 2 is known as a polaronic material where the transport mechanism is limited by small polaron hopping (SPH) [72,91,92,93,94]. …”

Section: Resultsmentioning

confidence: 99%

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

et al. 2017

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P-type Mg doped CuCrO2 thin films have been deposited on fused silica substrates by Radio-Frequency (RF) magnetron sputtering. The as-deposited CuCrO2:Mg thin films have been annealed at different temperatures (from 450 to 650 °C) under primary vacuum to obtain the delafossite phase. The annealed samples exhibit 3R delafossite structure. Electrical conductivity σ and Seebeck coefficient S of all annealed films have been measured from 40 to 220 °C. The optimized properties have been obtained for CuCrO2:Mg thin film annealed at 550 °C. At a measurement temperature of 40 °C, this sample exhibited the highest electrical conductivity of 0.60 S·cm−1 with a Seebeck coefficient of +329 µV·K−1. The calculated power factor (PF = σS²) was 6 µW·m−1·K−2 at 40 °C and due to the constant Seebeck coefficient and the increasing electrical conductivity with measurement temperature, it reached 38 µW·m−1·K−2 at 220 °C. Moreover, according to measurement of the Seebeck coefficient and electrical conductivity in temperature, we confirmed that CuCrO2:Mg exhibits hopping conduction and degenerates semiconductor behavior. Carrier concentration, Fermi level, and hole effective mass have been discussed.

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Section: Resultsmentioning

confidence: 99%

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

et al. 2017

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“…Mg:Cr2O3 films grown on Al2O3 by the same group showed a small polaron hopping conduction being the limiting factor in the material's conductivity. 168,169 Recently Zhang et al have reported perovskite Sr-doped LaCrO3 (La1-xSrxCrO3) with high figure of merits as new p-type TCOs. 164 The authors have shown that the lowest excitation in LaCrO3 results from a t2g 3 → eg 0 transition is at ≈2.8 eV but formally dipole forbidden.…”

Section: Cr-based Oxides (3d 3 )mentioning

confidence: 99%

P-type transparent conducting oxides

Zhang

Blamire

et al. 2016

J. Phys.: Condens. Matter

329

256

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Transparent conducting oxides constitute a unique class of materials combining properties of electrical conductivity and optical transparency in a single material. They are needed for a wide range of applications including solar cells, flat panel displays, touch screens, light emitting diodes and transparent electronics. Most of the commercially available TCOs are n-type, such as Sn doped In2O3, Al doped ZnO, and F doped SnO2. However, the development of efficient p-type TCOs remains an outstanding challenge. This challenge is thought to be due to the localized nature of the O 2p derived valence band which leads to difficulty in introducing shallow acceptors and large hole effective masses. In 1997 Hosono and co-workers (1997 Nature 389 939) proposed the concept of 'chemical modulation of the valence band' to mitigate this problem using hybridization of O 2p orbitals with close-shell Cu 3d (10) orbitals. This work has sparked tremendous interest in designing p-TCO materials together with deep understanding the underlying materials physics. In this article, we will provide a comprehensive review on traditional and recently emergent p-TCOs, including Cu(+)-based delafossites, layered oxychalcogenides, nd (6) spinel oxides, Cr(3+)-based oxides (3d (3)) and post-transition metal oxides with lone pair state (ns (2)). We will focus our discussions on the basic materials physics of these materials in terms of electronic structures, doping and defect properties for p-type conductivity and optical properties. Device applications based on p-TCOs for transparent p-n junctions will also be briefly discussed.

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“…In 2 O 3 [31], NiO [24,26,32,33], SnO/SnO x [34][35][36][37] and b-Ga 2 O 3 [38][39][40]. (ii) Mixed oxides: In 2 O 3 -Ag 2 O [41,42]; (iii) Chromium based oxides: LaCrO 3 [43], Cr 2 O 3 [44,45]; (iv) Ag-, Cu-, Pd-and Pt-based delafossites [46][47][48][49][50][51][52][53][54][55][56]; (v) Layered oxychalcogenides: LaCuOS [57][58][59] and LaCuOSe [60]; (vi) Spinel oxides: NiCo 2 O 4 [61,62], ZnCo 2 O 4 [63,64], ZnIr 2 O 4 [63] and ZnRh 2 O 4 [65,66], etc. ; (vii) Others: SnSeO [67], Ba 2 BiTaO 6 [68], SrCu 2 O 2 [69][70][71], [Cu 2 S 2 ][Sr 3 Sc 2 O 5 ] [72] or La 2/3 Sr 1/ 3 VO 3 [73].…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

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

et al. 2022

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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

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X-ray spectroscopic studies of the electronic structure of chromium-basedp-type transparent conducting oxides

Cited by 16 publications

References 49 publications

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

P-type transparent conducting oxides

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

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