About Carrier's Self‐Trapping and Dynamical Rashba Splitting in the 2D Hybrid Perovskite (BA) <sub>2</sub> (MA) <sub>2</sub> Pb <sub>3</sub> l <sub>10</sub>

Time- and Angle-Resolved Photoelectron Spectroscopy (tr-ARPES) is employed to monitor photoexcited electrons in the 2D hybrid perovskite (BA) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics><mml:msub><mml:mrow></mml:mrow> <mml:mn>2</mml:mn></mml:msub> <mml:annotation>$_2$</mml:annotation></mml:semantics> </mml:math> (MA) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:msub><mml:mrow></mml:mrow> <mml:mn>2</mml:mn></mml:msub> <mml:mi>Pb</mml:mi></mml:mrow> <mml:annotation>$_2{\rm Pb}$</mml:annotation></mml:semantics> </mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:msub><mml:mrow></mml:mrow> <mml:mn>3</mml:mn></mml:msub> <mml:mi>I</mml:mi></mml:mrow> <mml:annotation>$_3{\rm I}$</mml:annotation></mml:semantics> </mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics><mml:msub><mml:mrow></mml:mrow> <mml:mn>10</mml:mn></mml:msub> <mml:annotation>$_{10}$</mml:annotation></mml:semantics> </mml:math> . Photoelectron intensity maps are in good agreement with ab-initio calculations of the band structure. The effective mass is <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics><mml:mrow><mml:mo>-</mml:mo> <mml:mn>0.18</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.02</mml:mn> <mml:msub><mml:mi>m</mml:mi> <mml:mn>0</mml:mn></mml:msub> </mml:mrow> <mml:annotation>$-0.18 \pm 0.02 m_0$</mml:annotation></mml:semantics> </mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics><mml:mrow><mml:mn>0.12</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.02</mml:mn> <mml:msub><mml:mi>m</mml:mi> <mml:mn>0</mml:mn></mml:msub> </mml:mrow> <mml:annotation>$0.12 \pm 0.02 m_0$</mml:annotation></mml:semantics> </mml:math> for holes and electrons, respectively. In the photoexcited state, spin-orbit splitting of the conduction band cannot be resolved. This sets the upper bound of photoinduced Rashba coupling to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:msub><mml:mi>α</mml:mi> <mml:mi>C</mml:mi></mml:msub> <mml:mo><</mml:mo> <mml:mn>2.5</mml:mn></mml:mrow> <mml:annotation>$\alpha _C<2.5$</mml:annotation></mml:semantics> </mml:math> eVÅ. The correlated electron-hole plasma evolves in Wannier excitons with Bohr radius of 2.8 nm, while no sign of self-trapping in small polarons is found within the investigated time window of up to 120 ps following photoexcitation.

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Small
Published
2026-02-25
DOI
https://doi.org/10.1002/smll.202511410
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Perovskite Materials and Applications
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article

About Carrier's Self‐Trapping and Dynamical Rashba Splitting in the 2D Hybrid Perovskite (BA) 2 (MA) 2 Pb 3 l 10

Nitin Mallik, Sebastian F. Maehrlein, A. Taleb‐Ibrahimi, L. Perfetti et al.
Small
Perovskite Materials and Applications
article

About Carrier's Self‐Trapping and Dynamical Rashba Splitting in the 2D Hybrid Perovskite (BA) 2 (MA) 2 Pb 3 l 10

Nitin Mallik, Sebastian F. Maehrlein, A. Taleb‐Ibrahimi, L. Perfetti, E. Papalazarou, M. Marsi, A. K. Pramanik, В. П. Горелов, Guénolé Huitric, Yannis Laplace, Stefano Ponzoni, Kaibo Zheng, E. Deleporte, Azzedine Bendounan, Tönu Pullerits, Weiyan Qi
article en

Abstract

Time- and Angle-Resolved Photoelectron Spectroscopy (tr-ARPES) is employed to monitor photoexcited electrons in the 2D hybrid perovskite (BA) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics><mml:msub><mml:mrow></mml:mrow> <mml:mn>2</mml:mn></mml:msub> <mml:annotation>$_2$</mml:annotation></mml:semantics> </mml:math> (MA) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:msub><mml:mrow></mml:mrow> <mml:mn>2</mml:mn></mml:msub> <mml:mi>Pb</mml:mi></mml:mrow> <mml:annotation>$_2{\rm Pb}$</mml:annotation></mml:semantics> </mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:msub><mml:mrow></mml:mrow> <mml:mn>3</mml:mn></mml:msub> <mml:mi>I</mml:mi></mml:mrow> <mml:annotation>$_3{\rm I}$</mml:annotation></mml:semantics> </mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics><mml:msub><mml:mrow></mml:mrow> <mml:mn>10</mml:mn></mml:msub> <mml:annotation>$_{10}$</mml:annotation></mml:semantics> </mml:math> . Photoelectron intensity maps are in good agreement with ab-initio calculations of the band structure. The effective mass is <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics><mml:mrow><mml:mo>-</mml:mo> <mml:mn>0.18</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.02</mml:mn> <mml:msub><mml:mi>m</mml:mi> <mml:mn>0</mml:mn></mml:msub> </mml:mrow> <mml:annotation>$-0.18 \pm 0.02 m_0$</mml:annotation></mml:semantics> </mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics><mml:mrow><mml:mn>0.12</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.02</mml:mn> <mml:msub><mml:mi>m</mml:mi> <mml:mn>0</mml:mn></mml:msub> </mml:mrow> <mml:annotation>$0.12 \pm 0.02 m_0$</mml:annotation></mml:semantics> </mml:math> for holes and electrons, respectively. In the photoexcited state, spin-orbit splitting of the conduction band cannot be resolved. This sets the upper bound of photoinduced Rashba coupling to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:msub><mml:mi>α</mml:mi> <mml:mi>C</mml:mi></mml:msub> <mml:mo><</mml:mo> <mml:mn>2.5</mml:mn></mml:mrow> <mml:annotation>$\alpha _C<2.5$</mml:annotation></mml:semantics> </mml:math> eVÅ. The correlated electron-hole plasma evolves in Wannier excitons with Bohr radius of 2.8 nm, while no sign of self-trapping in small polarons is found within the investigated time window of up to 120 ps following photoexcitation.

SmallVol. 22(17)
Centre National de la Recherche Scientifique (FR), École Polytechnique (FR), Lund University (SE), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université Paris-Saclay (FR), Laboratoire de physique des Solides (FR), Fritz Haber Institute of the Max Planck Society (DE), Synchrotron soleil (FR), Helmholtz-Zentrum Dresden-Rossendorf (DE), CentraleSupélec (FR), Hochschule für Technik und Wirtschaft Dresden – University of Applied Sciences (DE), Technische Universität Dresden (DE), Technical University of Denmark (DK)
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Perovskite Materials and Applications
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