Remanent Polarization and Strong Photoluminescence Modulation by an External Electric Field in Epitaxial CsPbBr3Nanowires

Ella Sanders; Yahel Soffer; Tommaso Salzillo; Maor Rosenberg; Omri Bar-Elli; Omer Yaffe; Ernesto Joselevich; Dan Oron

doi:10.1021/acsnano.1c04905

Remanent Polarization and Strong Photoluminescence Modulation by an External Electric Field in Epitaxial CsPbBr₃Nanowires

Ella Sanders, Yahel Soffer, Tommaso Salzillo, Maor Rosenberg, Omri Bar-Elli, Omer Yaffe, Ernesto Joselevich^*, Dan Oron^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Metal halide perovskites (MHPs) have unique characteristics and hold great potential for next-generation optoelectronic technologies. Recently, the importance of lattice strain in MHPs has been gaining recognition as a significant optimization parameter for device performance. While the effect of strain on the fundamental properties of MHPs has been at the center of interest, its combined effect with an external electric field has been largely overlooked. Here we perform an electric-field-dependent photoluminescence study on heteroepitaxially strained surface-guided CsPbBr₃ nanowires. We reveal an unexpected strong linear dependence of the photoluminescence intensity on the alternating field amplitude, stemming from an induced internal dipole. Using low-frequency polarized-Raman spectroscopy, we reveal structural modifications in the nanowires under an external field, associated with the observed polarity. These results reflect the important interplay between strain and an external field in MHPs and offer opportunities for the design of MHP-based optoelectronic nanodevices.

Original language	English
Pages (from-to)	16130-16138
Number of pages	9
Journal	ACS Nano
Volume	15
Issue number	10
DOIs	https://doi.org/10.1021/acsnano.1c04905
Publication status	Published - 26 Oct 2021

Funding

he authors thank Dr. Ron Tenne, Dr. Venkata Jayasurya Yallapragada, Dr. Regev Ben Zvi, Dr. David Ehre, Prof. Aron Walsh, and Prof. David Cahen for fruitful discussions, and Dekel Nakar for critically reviewing the manuscript. We are grateful to Dr. Miri Kazes and Dr. Gili Yaniv for providing the colloidal CsPbBr QDs samples, their TEM images, and analysis and for sharing their useful MHP structural insights. We thank Dr. Sigalit Aharon for providing the CsPbBr microcrystals. E.S. is supported by the Sustainability and Energy Research Initiative (SAERI) at the Weizmann Institute. Y.S. is supported by the Ariane de Rothschild Women Doctoral Program. D.O. is the incumbent of the Harry Weinrebe Professorial Chair of laser physics. E.J. is the incumbent of the Drake Family Professorial Chair of Nanotechnology and Director of the Helen and Martin Kimmel Centre for Nanoscale Science at the Weizmann Institute.

All Science Journal Classification (ASJC) codes

General Materials Science
General Engineering
General Physics and Astronomy

Access to Document

10.1021/acsnano.1c04905Licence: CC BY

Cite this

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abstract = "Metal halide perovskites (MHPs) have unique characteristics and hold great potential for next-generation optoelectronic technologies. Recently, the importance of lattice strain in MHPs has been gaining recognition as a significant optimization parameter for device performance. While the effect of strain on the fundamental properties of MHPs has been at the center of interest, its combined effect with an external electric field has been largely overlooked. Here we perform an electric-field-dependent photoluminescence study on heteroepitaxially strained surface-guided CsPbBr3 nanowires. We reveal an unexpected strong linear dependence of the photoluminescence intensity on the alternating field amplitude, stemming from an induced internal dipole. Using low-frequency polarized-Raman spectroscopy, we reveal structural modifications in the nanowires under an external field, associated with the observed polarity. These results reflect the important interplay between strain and an external field in MHPs and offer opportunities for the design of MHP-based optoelectronic nanodevices.",

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AU - Soffer, Yahel

AU - Salzillo, Tommaso

AU - Rosenberg, Maor

AU - Bar-Elli, Omri

AU - Yaffe, Omer

AU - Joselevich, Ernesto

AU - Oron, Dan

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