Fast and Anomalous Exciton Diffusion in Two-Dimensional Hybrid Perovskites

Jonas D. Ziegler; Jonas Zipfel; Barbara Meisinger; Matan Menahem; Xiangzhou Zhu; Takashi Taniguchi; Kenji Watanabe; Omer Yaffe; David A. Egger; Alexey Chernikov

doi:10.1021/acs.nanolett.0c02472

Fast and Anomalous Exciton Diffusion in Two-Dimensional Hybrid Perovskites

Jonas D. Ziegler, Jonas Zipfel, Barbara Meisinger, Matan Menahem, Xiangzhou Zhu, Takashi Taniguchi, Kenji Watanabe, Omer Yaffe, David A. Egger, Alexey Chernikov^*

^*Corresponding author for this work

Department of Molecular Chemistry and Materials Science Perlman

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

57 Citations (Scopus)

Abstract

Two-dimensional hybrid perovskites are currently in the spotlight of condensed matter and nanotechnology research due to their intriguing optoelectronic and vibrational properties with emerging potential for light-harvesting and light-emitting applications. While it is known that these natural quantum wells host tightly bound excitons, the mobilities of these fundamental optical excitations at the heart of the optoelectronic applications are barely explored. Here, we directly monitor the diffusion of excitons through ultrafast emission microscopy from liquid helium to room temperature in hBN-encapsulated two-dimensional hybrid perovskites. We find very fast diffusion with characteristic hallmarks of free exciton propagation for all temperatures above 50 K. In the cryogenic regime, we observe nonlinear, anomalous behavior with an exceptionally rapid expansion of the exciton cloud followed by a very slow and even negative effective diffusion. We discuss our findings in view of efficient exciton-phonon coupling, highlighting two-dimensional hybrids as promising platforms for basic research and optoelectronic applications.

Original language	English
Pages (from-to)	6674-6681
Number of pages	8
Journal	Nano Letters
Volume	20
Issue number	9
Early online date	10 Aug 2020
DOIs	https://doi.org/10.1021/acs.nanolett.0c02472
Publication status	Published - 9 Sept 2020

Funding

We thank our colleagues Mikhail Glazov, Paulina Plochocka, Sivan Refaely-Abramson, Claudia Draxl, and Henry Snaith for helpful discussions, Hong Li for discussions regarding band-structure calculations, Robin P. Puchert for the support with AFM measurements, John M. Lupton for sharing the AFM, and Marvin Kulig for software support. Financial support by the DFG via SPP2196 Priority Program (CH 1672/3-1) and Emmy Noether Initiative (CH 1672/1-1) is gratefully acknowledged. D.A.E. acknowledges funding from the Alexander von Humboldt Foundation within the framework of the Sofja Kovalevskaja Award, endowed by the German Federal Ministry of Education and Research; the Technical University of Munich - Institute for Advanced Study, funded by the German Excellence Initiative and the European Union Seventh Framework Programme under Grant Agreement 291763; and the DFG under Germany’s Excellence Strategy - EXC 2089/1-390776260. O.Y. acknowledges funding from ISF (1861/17) and ERC (850041 - ANHARMONIC). K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant JPMXP0112101001, JSPS KAKENHI Grant JP20H00354 and the CREST(JPMJCR15F3), JST.

All Science Journal Classification (ASJC) codes

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

Access to Document

10.1021/acs.nanolett.0c02472

https://arxiv.org/abs/2006.14843Licence: Other

Cite this

@article{21233ae006d440819b973ba8166f260a,

title = "Fast and Anomalous Exciton Diffusion in Two-Dimensional Hybrid Perovskites",

abstract = "Two-dimensional hybrid perovskites are currently in the spotlight of condensed matter and nanotechnology research due to their intriguing optoelectronic and vibrational properties with emerging potential for light-harvesting and light-emitting applications. While it is known that these natural quantum wells host tightly bound excitons, the mobilities of these fundamental optical excitations at the heart of the optoelectronic applications are barely explored. Here, we directly monitor the diffusion of excitons through ultrafast emission microscopy from liquid helium to room temperature in hBN-encapsulated two-dimensional hybrid perovskites. We find very fast diffusion with characteristic hallmarks of free exciton propagation for all temperatures above 50 K. In the cryogenic regime, we observe nonlinear, anomalous behavior with an exceptionally rapid expansion of the exciton cloud followed by a very slow and even negative effective diffusion. We discuss our findings in view of efficient exciton-phonon coupling, highlighting two-dimensional hybrids as promising platforms for basic research and optoelectronic applications.",

author = "Ziegler, {Jonas D.} and Jonas Zipfel and Barbara Meisinger and Matan Menahem and Xiangzhou Zhu and Takashi Taniguchi and Kenji Watanabe and Omer Yaffe and Egger, {David A.} and Alexey Chernikov",

year = "2020",

month = sep,

day = "9",

doi = "10.1021/acs.nanolett.0c02472",

language = "English",

volume = "20",

pages = "6674--6681",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society",

number = "9",

}

TY - JOUR

T1 - Fast and Anomalous Exciton Diffusion in Two-Dimensional Hybrid Perovskites

AU - Ziegler, Jonas D.

AU - Zipfel, Jonas

AU - Meisinger, Barbara

AU - Menahem, Matan

AU - Zhu, Xiangzhou

AU - Taniguchi, Takashi

AU - Watanabe, Kenji

AU - Yaffe, Omer

AU - Egger, David A.

AU - Chernikov, Alexey

PY - 2020/9/9

Y1 - 2020/9/9

N2 - Two-dimensional hybrid perovskites are currently in the spotlight of condensed matter and nanotechnology research due to their intriguing optoelectronic and vibrational properties with emerging potential for light-harvesting and light-emitting applications. While it is known that these natural quantum wells host tightly bound excitons, the mobilities of these fundamental optical excitations at the heart of the optoelectronic applications are barely explored. Here, we directly monitor the diffusion of excitons through ultrafast emission microscopy from liquid helium to room temperature in hBN-encapsulated two-dimensional hybrid perovskites. We find very fast diffusion with characteristic hallmarks of free exciton propagation for all temperatures above 50 K. In the cryogenic regime, we observe nonlinear, anomalous behavior with an exceptionally rapid expansion of the exciton cloud followed by a very slow and even negative effective diffusion. We discuss our findings in view of efficient exciton-phonon coupling, highlighting two-dimensional hybrids as promising platforms for basic research and optoelectronic applications.

AB - Two-dimensional hybrid perovskites are currently in the spotlight of condensed matter and nanotechnology research due to their intriguing optoelectronic and vibrational properties with emerging potential for light-harvesting and light-emitting applications. While it is known that these natural quantum wells host tightly bound excitons, the mobilities of these fundamental optical excitations at the heart of the optoelectronic applications are barely explored. Here, we directly monitor the diffusion of excitons through ultrafast emission microscopy from liquid helium to room temperature in hBN-encapsulated two-dimensional hybrid perovskites. We find very fast diffusion with characteristic hallmarks of free exciton propagation for all temperatures above 50 K. In the cryogenic regime, we observe nonlinear, anomalous behavior with an exceptionally rapid expansion of the exciton cloud followed by a very slow and even negative effective diffusion. We discuss our findings in view of efficient exciton-phonon coupling, highlighting two-dimensional hybrids as promising platforms for basic research and optoelectronic applications.

U2 - 10.1021/acs.nanolett.0c02472

DO - 10.1021/acs.nanolett.0c02472

M3 - Article

SN - 1530-6984

VL - 20

SP - 6674

EP - 6681

JO - Nano Letters

JF - Nano Letters

IS - 9

ER -

Fast and Anomalous Exciton Diffusion in Two-Dimensional Hybrid Perovskites

Abstract

Funding

All Science Journal Classification (ASJC) codes

Access to Document

Fingerprint

Cite this