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Title: Spotlight on hot carriers in halide perovskite luminescence
Authors: Lim, Melvin Jia Wei
Wang, Yue
Fu, Jianhui
Zhang, Qiannan
Sum, Tze Chien
Keywords: Science::Physics::Optics and light
Issue Date: 2022
Source: Lim, M. J. W., Wang, Y., Fu, J., Zhang, Q. & Sum, T. C. (2022). Spotlight on hot carriers in halide perovskite luminescence. ACS Energy Letters.
Project: MOE2019-T2-1-006 
Journal: ACS Energy Letters 
Abstract: Harnessing hot carriers’ (HC) excess energy is an attractive approach to surpass the Shockley-Queisser limit. Halide perovskites possess desirable slow HC cooling properties for developing next-generation solar cells. Their HC cooling properties on the ultrafast timescale are well-reported using a myriad of techniques. However, there remains a significant gap between the manifestations of such ultrafast phenomena into the steady state, which is crucial towards translation into real-world efficiency enhancements. Here, we illuminate the connection between these two realms in their steady-state photoluminescence spectra with a unified model that retrieves essential HC metrics like carrier temperature and thermalization coefficient under non-equilibrium conditions. Our findings reveal that perovskites’ thermalization coefficients are an order of magnitude lower than incumbent absorbers. Importantly, our direct approach deepens our understanding of HC contributions to efficiency enhancements and enables wider accessibility to the HC research community, which will help accelerate the development of perovskite HC solar cells.
ISSN: 2380-8195
DOI: 10.1021/acsenergylett.1c02581
DOI (Related Dataset): 10.21979/N9/PMBK22
Schools: School of Physical and Mathematical Sciences 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Energy 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
Appears in Collections:ERI@N Journal Articles
SPMS Journal Articles

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