Making and breaking of the exciton in layered halide hybrid perovskites

Mikaël Kepenekian^a, Boubacar Traore^a, Jean-Christophe Blancon^b, Hsinhan Tsai^b, Wanyi Nie^b, Constantinos Stoumpos^c, Laurent Pedesseau^d, Claudine Katan^a, Sergei Tretiak^b, Mercouri Kanatzidis^c, Jacky Even^d, Aditya Mohite^b

^aInstitut des Sciences Chimiques de Rennes, CNRS, Université de Rennes 1, Ecole Nationale Supérieure de Chimie de Rennes, INSA Rennes, Rennes, France

^bLos Alamos National Laboratory, US, MS-J567, Los Alamos, NM 87545, United States

^cDepartment of Chemistry, Northwestern University, United States, Sheridan Road, 2145, Evanston, United States

^dFonctions Optiques pour les Technologies de l’Information (FOTON), Institut National des Sciences Appliquées (INSA) de Rennes, CNRS, UMR 6082, Rennes, France

NIPHO
Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)

Perovskite Photonics and Optoelectronics (PEROPTO18). 1st March

Rennes, France, 2018 February 27th - March 1st

Organizers: Jacky Even and Sam Stranks

Oral, Mikaël Kepenekian, presentation 036
DOI: https://doi.org/10.29363/nanoge.abxpvperopto.2018.036
Publication date: 11th December 2017

Layered halide hybrid organic−inorganic perovskites [1] have been the subject of intense investigation before the rise of three-dimensional (3D) halide perovskites and their impressive performance in solar cells. Recently, layered perovskites have also been proposed as attractive alternatives for photostable solar cells [2] and revisited for light-emitting devices. Interestingly, these performances can be traced back to extremely efficient internal exciton dissociation through edge states identified on thin films and single crystals [3].

Layered perovskites present fascinating features with inherent quantum and dielectric confinements imposed by the organic layers sandwiching the inorganic core, and computational approaches have successfully help rationalized their properties (excitonic, Rashba effects, etc.) [4-6]. Here, we propose a joint spectroscopic and computational investigation to unravel the origin of the recently identified layer-edge states in layered Ruddlesden-Popper phases with inorganic layers containing n = 1 to 4 octahedra. We show that for n > 2, the system presents a localized surface state within the band gap.

References

[1] L. Pedesseau et al., ACS Nano (2016), 10, 9776.

[2] H. Tsai et al., Nature (2016), 536, 312.

[3] J.-C. Blancon et al., Science (2017), 355, 1288.

[4] M. Kepenekian et al., ACS Nano (2015), 12, 11557.

[5] D. Sapori, M. Kepenekian, L. Pedesseau, C. Katan, J. Even, Nanoscale (2016), 8, 6369.

[6] M. D. Smith et al., Chem. Sci. (2017), 8, 1960.

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