Probing the local electronic structure in metal halide perovskites through cobalt substitution

DOI: 10.1002/smtd.202300095

Authors: Amir A. Haghighirad (University of Oxford; Karlsruhe Institute of Technology) , Matthew T. Klug (Oxford Photovoltaics Ltd) , L. B. Duffy (University of Oxford) , Junjie Liu (University of Oxford) , Arzhang Ardavan (University of Oxford) , Gerrit Van Der Laan (Diamond Light Source) , Thorsten Hesjedal (University of Oxford) , Henry J. Snaith (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Small Methods , VOL 642

State: Published (Approved)
Published: March 2023
Diamond Proposal Number(s): 16141

Abstract: Owing to the unique chemical and electronic properties arising from 3d-electrons, substitution with transition metal ions is one of the key routes for engineering new functionalities into materials. While this approach has been used extensively in complex metal oxide perovskites, metal halide perovskites have largely resisted facile isovalent substitution. In this work, it is demonstrated that the substitution of Co2+ into the lattice of methylammonium lead triiodide imparts magnetic behavior to the material while maintaining photovoltaic performance at low concentrations. In addition to comprehensively characterizing its magnetic properties, the Co2+ ions themselves are utilized as probes to sense the local electronic environment of Pb in the perovskite, thereby revealing the nature of their incorporation into the material. A comprehensive understanding of the effect of transition metal incorporation is provided, thereby opening the substitution gateway for developing novel functional perovskite materials and devices for future technologies.

Journal Keywords: electron spin resonance; metal halide perovskites; optical spectroscopy; solar cells; X-ray magnetic spectroscopy

Diamond Keywords: Photovoltaics; Semiconductors

Subject Areas: Materials, Chemistry, Physics


Instruments: I10-Beamline for Advanced Dichroism

Added On: 13/03/2023 09:52

Documents:
Small Methods - 2023 - Haghighirad - Probing the Local Electronic Structure in Metal Halide Perovskites through Cobalt.pdf

Discipline Tags:

Surfaces Earth Sciences & Environment Sustainable Energy Systems Energy Physics Climate Change Physical Chemistry Energy Materials Chemistry Materials Science interfaces and thin films Perovskites Metallurgy

Technical Tags:

Spectroscopy Circular Dichroism (CD) X-ray Magnetic Circular Dichroism (XMCD)