Journal ArticleDOI
Understanding the p-type defect chemistry of CuCrO2
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In this article, the authors examined the electronic structure, thermodynamic stability and the p-type defect chemistry of CuCrO2 using density functional theory with three different approaches to the exchange and correlation.Abstract:
CuCrO2 is the most promising Cu-based delafossite for p-type optoelectronic devices. Despite this, little is known about the p-type conduction mechanism of this material, with both CuI/CuII and CrIII/CrIV hole mechanisms being proposed. In this article we examine the electronic structure, thermodynamic stability and the p-type defect chemistry of this ternary compound using density functional theory with three different approaches to the exchange and correlation; the generalized-gradient-approximation of Perdew, Burke and Ernzerhof (PBE), PBE with an additional correction for on-site Coulombic interactions (PBE + U) and the nonlocal, screened-exchange hybrid functional HSE06. The fundamental band gap of CuCrO2 is demonstrated to be indirect in nature. Under all growth conditions, the dominant intrinsic p-type defect will be the Cu vacancy, with hole formation centered solely on the Cu sublattice. Mg doping is found to be significantly lower in energy than intrinsic defect formation, explaining the large increases in conductivity seen experimentally. Cu-rich/Cr-poor growth conditions are found to be optimal for both intrinsic and extrinsic (Mg doping) defect formation, and should be adopted to maximize performance.read more
Citations
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Journal ArticleDOI
Binary copper oxide semiconductors: From materials towards devices
Bruno K. Meyer,Angelika Polity,Daniel Reppin,Martin Becker,P. Hering,Peter J. Klar,Th. Sander,Christian T. Reindl,J. Benz,Martin Eickhoff,Christian Heiliger,Markus Heinemann,Jürgen Bläsing,Alois Krost,S. Shokovets,C. Müller,Carsten Ronning +16 more
TL;DR: In this article, the performance of three distinctly different phases, Cu2O, Cu4O3, and CuO, of this binary semiconductor can be prepared by thin-film deposition techniques, which differ in the oxidation state of copper.
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Electro- and Solar-Driven Fuel Synthesis with First Row Transition Metal Complexes.
Kristian E Dalle,Julien Warnan,Jane J. Leung,Bertrand Reuillard,Isabell S Karmel,Erwin Reisner +5 more
TL;DR: In this paper, a review of the literature on 3D metal-based molecular catalysts is presented, focusing on their immobilization on heterogeneous solid-state supports for the synthesis of renewable fuels from abundant water or greenhouse gas CO2.
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P-type transparent conducting oxides.
TL;DR: This article provides a comprehensive review on traditional and recently emergent p-TCOs, including Cu(+)-based delafossites, layered oxychalcogenides, nd (6) spinel oxides, Cr(3+-based oxides), and post-transition metal oxides with lone pair state (ns (2).
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Semiconducting transition metal oxides
TL;DR: This work reviews electronic structure calculations on the binary 3d oxides, so to distill trends and design principles for semiconducting transition metal oxides to identify those situations where small masses and band-like conduction are more likely to be expected.
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Sources of conductivity and doping limits in CdO from hybrid density functional theory.
TL;DR: This article uses screened hybrid DFT to study intrinsic defects and hydrogen impurities in CdO and identifies for the first time the source of charge carriers in this system and explains why the oxygen vacancy inCdO acts as a shallow donor and does not display negative-U behavior similar to all other wide band gap n-type oxides.
References
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Journal ArticleDOI
Generalized Gradient Approximation Made Simple
TL;DR: A simple derivation of a simple GGA is presented, in which all parameters (other than those in LSD) are fundamental constants, and only general features of the detailed construction underlying the Perdew-Wang 1991 (PW91) GGA are invoked.
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Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set.
Georg Kresse,Jürgen Furthmüller +1 more
TL;DR: An efficient scheme for calculating the Kohn-Sham ground state of metallic systems using pseudopotentials and a plane-wave basis set is presented and the application of Pulay's DIIS method to the iterative diagonalization of large matrices will be discussed.
Journal ArticleDOI
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set
Georg Kresse,Jürgen Furthmüller +1 more
TL;DR: A detailed description and comparison of algorithms for performing ab-initio quantum-mechanical calculations using pseudopotentials and a plane-wave basis set is presented in this article. But this is not a comparison of our algorithm with the one presented in this paper.
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Hybrid functionals based on a screened Coulomb potential
TL;DR: In this paper, a new hybrid density functional based on a screened Coulomb potential for the exchange interaction is proposed, which enables fast and accurate hybrid calculations, even of usually difficult metallic systems.
Journal ArticleDOI
Electron-energy-loss spectra and the structural stability of nickel oxide: An LSDA+U study
Sergei L. Dudarev,Gianluigi A. Botton,Sergey Y. Savrasov,Colin J. Humphreys,Adrian P. Sutton +4 more
TL;DR: In this article, the authors improved the description of both electron energy loss spectra and parameters characterizing the structural stability of the material compared with local spin density functional theory by taking better account of electron correlations in the $3d$ shell of metal ions in nickel oxide.