The Role of Inorganic CsBr Ruddlesden-Popper Planar Faults in Optoelectronic Properties of CsPbBr3 Perovskite Nanocrystals

ORAL

Abstract

Organic Ruddlesden-Popper (RP) planar faults were demonstrated to largely improve stability and opto-electronic performance of hybrid lead-halide perovskite nanocrystals (PNCs). The observed enhancements have been mainly explained by the hydrophobic electronically insulating nature of long-chain organic layers. Yet, similar improvement is seen in case of inorganic CsBr RP faults as well – highly water-soluble and sub-atomically thin. In this work, we attempt to define the role of inorganic CsBr faults in CsPbBr3 nanocrystals. A comprehensive analysis of CsPbBr3 nanocrystals with and without RP layers is performed. We find CsPbBr3 PNCs with RP faults to possess higher exciton binding energies, longer exciton lifetimes, and an exceptionally higher stability to photodegradation. In addition, the nanocrystals with RP faults are also shown to significantly outperform CsPbBr3 PNCs without RPs in light-emitting devices.

* The work is partially supported by the National Science Foundation under grantns DMR-1807263 and ECCS-1827846, and incentive funding from the College of Engineering and Electron Microscopy Core at the University of Missouri.

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Publication: *Goriacheva publishes under Morrell

Morrell, M.V.; Pickett, A.; Bhattacharya, P.; Guha, S.; Xing, Y. ACS Appl. Mater. Interfaces 2021, 13, 32, 38579–38585. Engineered Ruddlesden-Popper Planar Faults in Cesium Lead Bromide Perovskite Nanocrystals for Enhanced Optoelectronic Properties.

Morrell, M.V.; He, X.; Luo, G.; Thind, A.S.; White, T.A.; Hachtel, J.A.; Borisevich, A.Y.; Idrobo, J.C.; Mishra, R.; Xing, Y. ACS Applied Nano Materials 2018, 1 (11), 6091-6098. Significantly Enhanced Emission Stability of CsPbBr3 Nanocrystals via Chemically Induced Fusion Growth for Optoelectronic Devices.

Bhattacharya, P.; Morrell, M.V.; Xing, Y.; Mathai, C.J.; Yu, P.; Guha, S. J. Phys. Chem. Lett. 2021, 12, 16, 4092–4097. Enhanced Third Harmonic Generation in Lead Bromide Perovskites with Ruddlesden- Popper Planar Faults.

Thind, A.S.; Luo, G.; Hachtel, J.A.; Morrell, M.V.; Cho, S.B.; Borisevich, A.Y.; Idrobo, J.C.; Xing, Y.; Mishra, R. Adv. Mater. 2019, 31, 1805047. Atomic Structure and Electrical Activity of Grain Boundaries and Ruddlesden–Popper Faults in Cesium Lead Bromide Perovskite.

Presenters

  • Mariia V Goriacheva

    University of North Dakota

Authors

  • Mariia V Goriacheva

    University of North Dakota

  • Alec Pickett

    University of Missouri

  • PAYAL BHATTACHARYA

    University of Missouri

  • Suchismita Guha

    University of Missouri, Department of Physics and Astronomy, University of Missouri, Columbia, MO

  • Yangchuan Xing

    University of Missouri - Columbia