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Title: Low-Temperature Absorption, Photoluminescence, and Lifetime of CsPbX 3 (X = Cl, Br, I) Nanocrystals

Abstract

The absorption and photoluminescence, both steady–state and time–resolved, of CsPbX 3 (X = Cl, Br, I) nanocrystals are reported at temperatures ranging from 3 to 300 K. These measurements offer a unique window into the fundamental properties of this class of materials which is considered promising for light–emitting and detection devices. The bandgaps are shown to increase from low to high temperature, and none of the examined cesium–based perovskite nanocrystals exhibit a bandgap discontinuity in this temperature range suggesting constant crystal phase. Time–resolved measurements show that the radiative lifetime of the band–edge emission depends strongly on the halide ion and increases with heating. The increasing lifetime at higher temperatures is attributed primarily to free carriers produced from exciton fission, corroborated by the prevalence of excitonic character in absorption. Furthermore, the results particularly highlight many of the similarities in physical properties, such as low exciton binding energy and long lifetime, between CsPbI 3 and hybrid organic–inorganic plumbotrihalide perovskites.

Authors:
 [1];  [1]; ORCiD logo [2]
  1. Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States); Northwestern Univ., Evanston, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
OSTI Identifier:
1481177
Alternate Identifier(s):
OSTI ID: 1439255
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Functional Materials
Additional Journal Information:
Journal Volume: 28; Journal Issue: 30; Journal ID: ISSN 1616-301X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; absorption; excitons; lifetime; perovskites; photoluminescence

Citation Formats

Diroll, Benjamin T., Zhou, Hua, and Schaller, Richard D. Low-Temperature Absorption, Photoluminescence, and Lifetime of CsPbX3 (X = Cl, Br, I) Nanocrystals. United States: N. p., 2018. Web. doi:10.1002/adfm.201800945.
Diroll, Benjamin T., Zhou, Hua, & Schaller, Richard D. Low-Temperature Absorption, Photoluminescence, and Lifetime of CsPbX3 (X = Cl, Br, I) Nanocrystals. United States. doi:10.1002/adfm.201800945.
Diroll, Benjamin T., Zhou, Hua, and Schaller, Richard D. Sun . "Low-Temperature Absorption, Photoluminescence, and Lifetime of CsPbX3 (X = Cl, Br, I) Nanocrystals". United States. doi:10.1002/adfm.201800945. https://www.osti.gov/servlets/purl/1481177.
@article{osti_1481177,
title = {Low-Temperature Absorption, Photoluminescence, and Lifetime of CsPbX3 (X = Cl, Br, I) Nanocrystals},
author = {Diroll, Benjamin T. and Zhou, Hua and Schaller, Richard D.},
abstractNote = {The absorption and photoluminescence, both steady–state and time–resolved, of CsPbX3 (X = Cl, Br, I) nanocrystals are reported at temperatures ranging from 3 to 300 K. These measurements offer a unique window into the fundamental properties of this class of materials which is considered promising for light–emitting and detection devices. The bandgaps are shown to increase from low to high temperature, and none of the examined cesium–based perovskite nanocrystals exhibit a bandgap discontinuity in this temperature range suggesting constant crystal phase. Time–resolved measurements show that the radiative lifetime of the band–edge emission depends strongly on the halide ion and increases with heating. The increasing lifetime at higher temperatures is attributed primarily to free carriers produced from exciton fission, corroborated by the prevalence of excitonic character in absorption. Furthermore, the results particularly highlight many of the similarities in physical properties, such as low exciton binding energy and long lifetime, between CsPbI3 and hybrid organic–inorganic plumbotrihalide perovskites.},
doi = {10.1002/adfm.201800945},
journal = {Advanced Functional Materials},
number = 30,
volume = 28,
place = {United States},
year = {2018},
month = {5}
}

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