Phase-Transition-Induced Carrier Mass Enhancement in 2D Ruddlesden-Popper Perovskites

Michal Baranowski; Szymon Zelewski; Mikael Kepenekian; Boubacar Traoré; Joanna Urban; Alessandro Surrente; Krzysztof Galkowski; Duncan Maude; Agnieszka Kuc; Edward Booker; Robert Kudrawiec; Samuel Stranks; Paulina Plochocka

doi:10.1021/acsenergylett.9b01435

Journal articles

Phase-Transition-Induced Carrier Mass Enhancement in 2D Ruddlesden-Popper Perovskites

Michal Baranowski ^{1, 2} Szymon Zelewski ^{3, 2} Mikael Kepenekian ⁴ Boubacar Traoré ^{4, 5} Joanna Urban ³ Alessandro Surrente ¹ Krzysztof Galkowski ¹ Duncan Maude ¹ Agnieszka Kuc ⁶ Edward Booker ⁷ Robert Kudrawiec ² Samuel Stranks ⁷ Paulina Plochocka ^{1, 2, *}

* Corresponding author

1 LNCMI-T - Laboratoire national des champs magnétiques intenses - Toulouse

2 University of Wrocław [Poland]

3 LNCMI-G - Laboratoire national des champs magnétiques intenses - Grenoble

4 ISCR - Institut des Sciences Chimiques de Rennes

5 Institut FOTON - Institut des Fonctions Optiques pour les Technologies de l'informatiON

6 HZDR - Helmholtz-Zentrum Dresden-Rossendorf

7 Cavendish Lab

Abstract : There are a variety of possible ways to tune the optical properties of 2D perovskites, though the mutual dependence among different tuning parameters hinders our fundamental understanding of their properties. In this work, we attempt to address this issue for (CnH2n+1NH3)(2)PbI4 (with n = 4, 6, 8, 10, 12) using optical spectroscopy in high magnetic fields up to 67 T. Our experimental results, supported by DFT calculations, clearly demonstrate that the exciton reduced mass increases by around 30% in the low-temperature phase. This is reflected by a 2-3-fold decrease of the diamagnetic coefficient. Our studies show that the effective mass, which is an essential parameter for optoelectronic device operation, can be tuned by the variation of organic spacers and/or moderate cooling achievable using Peltier coolers. Moreover, we show that the complex absorption features visible in absorption/transmission spectra track each other in a magnetic field, providing strong evidence for the phonon-related nature of the observed side bands.

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Journal articles

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Chemical Sciences

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