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Title: Hot carriers perspective on the nature of traps in perovskites
Authors: Righetto, Marcello
Lim, Swee Sien
Giovanni, David
Lim, Melvin Jia Wei
Zhang, Qiannan
Ramesh, Sankaran
Tay, Eugene Yong Kang
Sum, Tze Chien
Keywords: Science::Physics
Issue Date: 2020
Source: Righetto, M., Lim, S. S., Giovanni, D., Lim, M. J. W., Zhang, Q., Ramesh, S., Tay, E. Y. K. & Sum, T. C. (2020). Hot carriers perspective on the nature of traps in perovskites. Nature Communications, 11(1), 2712-.
Project: M4080514 
MOE2017-T2-2- 002 
Journal: Nature Communications 
Abstract: Amongst the many spectacular properties of hybrid lead halide perovskites, their defect tolerance is regarded as the key enabler for a spectrum of high-performance optoelectronic devices that propel perovskites to prominence. However, the plateauing efficiency enhancement of perovskite devices calls into question the extent of this defect tolerance in perovskite systems; an opportunity for perovskite nanocrystals to fill. Through optical spectroscopy and phenomenological modeling based on the Marcus theory of charge transfer, we uncover the detrimental effect of hot carriers trapping in methylammonium lead iodide and bromide nanocrystals. Higher excess energies induce faster carrier trapping rates, ascribed to interactions with shallow traps and ligands, turning these into potent defects. Passivating these traps with the introduction of phosphine oxide ligands can help mitigate hot carrier trapping. Importantly, our findings extend beyond photovoltaics and are relevant for low threshold lasers, light-emitting devices and multi-exciton generation devices.
ISSN: 2041-1723
DOI: 10.1038/s41467-020-16463-7
DOI (Related Dataset): 10.21979/N9/EGH6UI
Schools: School of Physical and Mathematical Sciences 
Interdisciplinary Graduate School (IGS) 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2020 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit licenses/by/4.0/.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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