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Article Dans Une Revue Science Année : 2017

Extremely efficient internal exciton dissociation through edge states in layered 2D perovskites

Jean-Christophe Blancon
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Claudine Katan
Sergei Tretiak
Pulickel M Ajayan

Résumé

Understanding and controlling charge and energy flow in state-of-the-art semiconductor quantum-wells has enabled high-efficiency optoelectronic devices. Two-dimensional Ruddlesden-Popper perovskites are solution-processed quantum-wells wherein the band gap can be tuned by varying the perovskite layer thickness, which modulates the effective electron-hole confinement. We report that, counterintuitive to classical quantum-confined systems where photo-generated electrons and holes are strongly bound by Coulomb interactions or excitons, the photo-physics of thin films made of Ruddlesden-Popper perovskites with a thickness exceeding two perovskite crystal-units (>1.3 nanometers) is dominated by lower energy states associated with the local intrinsic electronic structure of the edges of the perovskite layers. These states provide a direct pathway for dissociating excitons into longer-lived free-carriers that significantly improve the performance of optoelectronic devices.
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Dates et versions

hal-01486953 , version 1 (10-03-2017)

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Jean-Christophe Blancon, Hsinhan Tsai, Wanyi Nie, Constantinos C Stoumpos, Laurent Pedesseau, et al.. Extremely efficient internal exciton dissociation through edge states in layered 2D perovskites. Science, 2017, 355 (6331), pp.1288-1292. ⟨10.1126/science.aal4211⟩. ⟨hal-01486953⟩
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