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Is there a polaron signature in angle-resolved photoemission of CsPbBr₃?

Maryam Sajedi1,2*, Maxim Krivenkov1*, Dmitry Marchenko1*, Jaime Sánchez-Barriga1*, Anoop K. Chandran3*, Andrei Varykhalov1*, Emile D. L. Rienks1*, Irene Aguilera4*, Stefan Blügel3*, Oliver Rader1*

1 Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany

2 Institut für Physik und Astronomie, Universita ̈t Potsdam, Karl-Liebknecht-Str. 24/25, 14476 Potsdam, Germany

3 Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Ju ̈lich and JARA, 52425, Jülich Germany

4 Institute of Energy and Climate Research IEK-5 Photovoltaics, Forschungszentrum Ju ̈lich, 52425 Juelich, Germany

* Corresponding authors emails: maryam.sajedi@helmholtz-berlin.de, maxim.krivenkov@helmholtz-berlin.de, dmitry.marchenko@helmholtz-berlin.de, jaime.sanchez-barriga@helmholtz-berlin.de, a.chandran@fz-juelich.de, andrei.varykhalov@helmholtz-berlin.de, emile.rienks@helmholtz-berlin.de, i.aguilera@fz-juelich.de, s.bluegel@fz-juelich.de, rader@helmholtz-berlin.de
DOI10.24435/materialscloud:93-j5 [version v1]

Publication date: Apr 11, 2022

How to cite this record

Maryam Sajedi, Maxim Krivenkov, Dmitry Marchenko, Jaime Sánchez-Barriga, Anoop K. Chandran, Andrei Varykhalov, Emile D. L. Rienks, Irene Aguilera, Stefan Blügel, Oliver Rader, Is there a polaron signature in angle-resolved photoemission of CsPbBr₃?, Materials Cloud Archive 2022.51 (2022), doi: 10.24435/materialscloud:93-j5.


The formation of large polarons has been proposed as reason for the high defect tolerance, low mobility, low charge carrier trapping and low nonradiative recombination rates of lead halide perovskites. Recently, direct evidence for large-polaron formation has been reported from a 50% effective mass enhancement in angle-resolved photoemission of CsPbBr₃ over theory for the orthorhombic structure. We present in-depth band dispersion measurements of CsPbBr₃ and GW calculations which lead to almost identical effective masses at the valence band maximum of 0.203+/-0.016 m₀ in experiment and 0.217 m₀ in orthorhombic theory. We argue that the effective mass can be explained solely on the basis of electron-electron correlation and large polaron formation cannot be concluded from photoemission data.

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large-polaron angle-resolved photoemission of CsPbBr3 GW calculations of CsPbBr3

Version history:

2022.51 (version v1) [This version] Apr 11, 2022 DOI10.24435/materialscloud:93-j5