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Impact of hole polaron formation on excitonic transitions in MgO from first principles

Journal Article · · Physical Review Materials
DOI:https://doi.org/10.1103/mpb2-3wrb· OSTI ID:3011354

Here, we present a first-principles investigation of the excitonic properties of magnesia (MgO), an ionic insulator known to host hole polarons. We combine a density functional theory-based approach for structural relaxation in the presence of the hole and many-body perturbation theory to describe the excitonic properties. We determine that the hole polaron introduces new in-gap occupied states 0.6–0.8 eV above the valence band maximum that lead to two low-energy peaks in the optical spectrum. The predicted redshift of the lowest-energy transition due to polaron formation of 0.8 eV agrees well with the experimental Stokes shift of 0.8–0.9 eV. Analysis of the exciton wave function indicates that the electron-hole pair consists of a localized hole and delocalized electron, but that the wave function retains its Wannier-Mott character even in the presence of the hole polaron. Our study demonstrates that combining these previously established methods allows for a relatively computationally inexpensive approach to studying the exciton polaron in materials where only one charge carrier forms a polaron.

Research Organization:
Boston Univ., MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0023402; AC02-05CH11231
OSTI ID:
3011354
Journal Information:
Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 12 Vol. 9; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (48)

Recent Progresses of Polarons: Fundamentals and Roles in Photocatalysis and Photoelectrocatalysis journal November 2023
Luminescence of Free and Relaxed Excitons in MgO journal May 1979
Excitons and edge luminescence in MgO journal November 1981
The self-trapped exciton journal January 1990
Exciton thermoreflectance of MgO and CaO journal December 1973
BerkeleyGW: A massively parallel computer package for the calculation of the quasiparticle and optical properties of materials and nanostructures journal June 2012
The PseudoDojo: Training and grading a 85 element optimized norm-conserving pseudopotential table journal May 2018
Polarons book January 2012
Low-Energy Charge-Transfer Excitons in Organic Solids from First-Principles: The Case of Pentacene journal June 2013
Polaron spin current transport in organic semiconductors journal March 2014
Momentarily trapped exciton polaron in two-dimensional lead halide perovskites journal March 2021
Exciton polaron formation and hot-carrier relaxation in rigid Dion–Jacobson-type two-dimensional perovskites journal May 2024
Polarons in materials journal March 2021
An ab initio study of self-trapped excitons in α-quartz journal April 2003
Commentary: The Materials Project: A materials genome approach to accelerating materials innovation journal July 2013
Ultrafast dynamics of hole self-localization in β -Ga2O3 journal March 2020
Identification of free and bound exciton emission of MgO single crystal in vacuum ultraviolet spectral range journal September 2021
Phonon screening and dissociation of excitons at finite temperatures from first principles journal July 2024
QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials journal September 2009
Modeling polarons in density functional theory: lessons learned from TiO2 journal March 2022
First-principles supercell calculations of small polarons with proper account for long-range polarization effects journal March 2018
Polarons in perovskite solar cells: effects on photovoltaic performance and stability journal February 2023
Electronic Spectrum and Ultraviolet Optical Properties of Crystalline MgO journal July 1967
Fröhlich polaron effective mass and localization length in cubic materials: Degenerate and anisotropic electronic bands journal December 2021
Ab initio self-consistent many-body theory of polarons at all couplings journal August 2022
Polarons free from many-body self-interaction in density functional theory journal September 2022
Exciton-phonon interaction calls for a revision of the “exciton” concept journal September 2022
Theory of excitonic polarons: From models to first-principles calculations journal January 2024
Electron correlation in semiconductors and insulators: Band gaps and quasiparticle energies journal October 1986
Theory of Self-Trapped Exciton Luminescence in Halide Crystals journal December 1973
Role of self-trapping in luminescence and p -type conductivity of wide-band-gap oxides journal February 2012
Extracting E versus k ⃗ effective band structure from supercell calculations on alloys and impurities journal February 2012
Optimized norm-conserving Vanderbilt pseudopotentials journal August 2013
Density functional theory based calculation of small-polaron mobility in hematite journal June 2014
Implications of the DFT+U method on polaron properties in energy materials journal September 2017
Ab initio theory of polarons: Formalism and applications journal June 2019
Exciton-Phonon Interaction and Relaxation Times from First Principles journal August 2020
Unified Approach to Polarons and Phonon-Induced Band Structure Renormalization journal August 2022
Excitonic Polarons and Self-Trapped Excitons from First-Principles Exciton-Phonon Couplings journal January 2024
Ab Initio Self-Trapped Excitons journal July 2024
Ground State of the Electron Gas by a Stochastic Method journal August 1980
Generalized Gradient Approximation Made Simple journal October 1996
Excited-State Forces within a First-Principles Green’s Function Formalism journal February 2003
Self-Trapped Excitons in Silicon Dioxide: Mechanism and Properties journal October 2005
Defect-induced exciton localization in bulk gallium nitride from many-body perturbation theory journal November 2019
Interfacial Exciton-Polaron Quenching in Organic Light-Emitting Diodes journal October 2024
Large polarons in lead halide perovskites journal August 2017
Polarons and Bipolarons book January 1996

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