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Title: The physics of interlayer exciton delocalization in Ruddlesden–Popper lead halide perovskites
Authors: Giovanni, David
Ramesh, Sankaran
Righetto, Marcello
Lim, Melvin Jia Wei
Zhang, Qiannan
Wang, Yue
Ye, Senyun
Xu, Qiang
Mathews, Nripan 
Sum, Tze Chien
Keywords: Science::Physics::Optics and light
Engineering::Materials::Photonics and optoelectronics materials
Issue Date: 2021
Source: Giovanni, D., Ramesh, S., Righetto, M., Lim, M. J. W., Zhang, Q., Wang, Y., Ye, S., Xu, Q., Mathews, N. & Sum, T. C. (2021). The physics of interlayer exciton delocalization in Ruddlesden–Popper lead halide perovskites. Nano Letters, 21(1), 405-413.
Project: NTU Start-up Grant M4080514 
Journal: Nano Letters 
Abstract: Two-dimensional (2D) lead halide Ruddlesden–Popper perovskites (RPP) have recently emerged as a prospective material system for optoelectronic applications. Their self-assembled multi quantum-well structure gives rise to the novel interwell energy funnelling phenomenon, which is of broad interests for photovoltaics, light-emission applications, and emerging technologies (e.g., spintronics). Herein, we develop a realistic finite quantum-well superlattice model that corroborates the hypothesis of exciton delocalization across different quantum-wells in RPP. Such delocalization leads to a sub-50 fs coherent energy transfer between adjacent wells, with the efficiency depending on the RPP phase matching and the organic large cation barrier lengths. Our approach provides a coherent and comprehensive account for both steady-state and transient dynamical experimental results in RPPs. Importantly, these findings pave the way for a deeper understanding of these systems, as a cornerstone crucial for establishing material design rules to realize efficient RPP-based devices.
ISSN: 1530-6992
DOI: 10.1021/acs.nanolett.0c03800
DOI (Related Dataset):
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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