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Rashba-Type Band Splitting Effect in 2D (PEA)2PbI4 Perovskites and Its Impact on Exciton-Phonon Coupling
Supriya Ghosh1,2, Bapi Pradhan3, Arkamita Bandyopadhyay4
1School of Science, Constructor University, Campus Ring 1, 28759 Bremen, Germany.
Organic spacer cation polarity is key to Rashba band splitting in 2D Ruddlesden-Popper perovskites. Low polarity cations induce distortions crucial for this electronic property and exciton-phonon interactions.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid-State Chemistry
Background:
- Recent studies have reported Rashba effects in 2D Ruddlesden-Popper (RP) hybrid perovskites.
- The specific influence of organic spacer cations on Rashba band splitting is not fully understood.
Purpose of the Study:
- To elucidate the role of organic spacer cations in Rashba band splitting in 2D RP hybrid perovskites.
- To investigate the relationship between cation polarity, structural distortions, and electronic band splitting.
Main Methods:
- Utilized temperature-dependent two-photon photoluminescence (2PPL) spectroscopy.
- Employed time-resolved photoluminescence spectroscopy.
- Performed density functional theory (DFT) calculations.
Main Results:
- Organic spacer cation polarity is critical for inducing structural distortions that lead to Rashba-type band splitting.
- Rashba band splitting was observed for organic cations with low polarity, but not for more polar ones.
- Stronger exciton-phonon interactions were detected, correlated with the Rashba band splitting effect.
Conclusions:
- The polarity of organic spacer cations significantly influences Rashba band splitting in 2D RP hybrid perovskites.
- Structural distortions induced by cation polarity are the primary mechanism for Rashba-type band splitting.
- These findings highlight the importance of organic cation selection for tuning the electronic properties of 2D perovskites.
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