The physics of interlayer exciton delocalization in Ruddlesden–Popper lead halide perovskites

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 f...

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Main Authors: Giovanni, David, Ramesh, Sankaran, Righetto, Marcello, Lim, Melvin Jia Wei, Zhang, Qiannan, Wang, Yue, Ye, Senyun, Xu, Qiang, Mathews, Nripan, Sum, Tze Chien
其他作者: School of Physical and Mathematical Sciences
格式: Article
語言:English
出版: 2021
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在線閱讀:https://hdl.handle.net/10356/147025
https://doi.org/10.21979/N9/OIYOW1
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機構: Nanyang Technological University
語言: English
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總結: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.