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Title: Intraband Cooling in All‐Inorganic and Hybrid Organic–Inorganic Perovskite Nanocrystals

Abstract

Intraband relaxation in all-inorganic cesium lead tribromide (CsPbBr3) and hybrid organic-inorganic formamidinium lead tribromide (FAPbBr 3) nanocrystals is experimentally investigated for a range of particle sizes, excitation energies, sample temperatures, and excitation fluences. Hot carriers in CsPbBr 3 nanocrystals consistently exhibit slower cooling than FAPbBr 3 nanocrystals in the single electron-hole pair per nanocrystal regime. In both compositions, long-lived hot carriers (>3 ps) are only observed at excitation densities corresponding to production of multiple electron-hole pairs per nanocrystal-and concomitant Auger recombination. Furthermore, these presented results are distinct from previous reports in bulk hybrid perovskite materials that convey persistent hot carriers at low excitation fluences. Time-resolved photoluminescence confirms the rapid cooling of carriers in the low-fluence (single electron-hole pair per nanocrystal) regime. Intraband relaxation processes, as a function of excitation energy, size, and temperature are broadly consistent with other nanocrystalline semiconductor materials.

Authors:
 [1]; ORCiD logo [2]
  1. Argonne National Lab. (ANL), Lemont, IL (United States). Center for Nanoscale Materials
  2. Argonne National Lab. (ANL), Lemont, IL (United States). Center for Nanoscale Materials; Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
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:
1574294
Alternate Identifier(s):
OSTI ID: 1543024
Grant/Contract Number:  
AC02-06CH11357; AC02‐06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Functional Materials
Additional Journal Information:
Journal Volume: 29; Journal Issue: 37; Journal ID: ISSN 1616-301X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; hot carriers; intraband; nanocrystals; perovskites

Citation Formats

Diroll, Benjamin T., and Schaller, Richard D. Intraband Cooling in All‐Inorganic and Hybrid Organic–Inorganic Perovskite Nanocrystals. United States: N. p., 2019. Web. doi:10.1002/adfm.201901725.
Diroll, Benjamin T., & Schaller, Richard D. Intraband Cooling in All‐Inorganic and Hybrid Organic–Inorganic Perovskite Nanocrystals. United States. doi:10.1002/adfm.201901725.
Diroll, Benjamin T., and Schaller, Richard D. Wed . "Intraband Cooling in All‐Inorganic and Hybrid Organic–Inorganic Perovskite Nanocrystals". United States. doi:10.1002/adfm.201901725.
@article{osti_1574294,
title = {Intraband Cooling in All‐Inorganic and Hybrid Organic–Inorganic Perovskite Nanocrystals},
author = {Diroll, Benjamin T. and Schaller, Richard D.},
abstractNote = {Intraband relaxation in all-inorganic cesium lead tribromide (CsPbBr3) and hybrid organic-inorganic formamidinium lead tribromide (FAPbBr3) nanocrystals is experimentally investigated for a range of particle sizes, excitation energies, sample temperatures, and excitation fluences. Hot carriers in CsPbBr3 nanocrystals consistently exhibit slower cooling than FAPbBr3 nanocrystals in the single electron-hole pair per nanocrystal regime. In both compositions, long-lived hot carriers (>3 ps) are only observed at excitation densities corresponding to production of multiple electron-hole pairs per nanocrystal-and concomitant Auger recombination. Furthermore, these presented results are distinct from previous reports in bulk hybrid perovskite materials that convey persistent hot carriers at low excitation fluences. Time-resolved photoluminescence confirms the rapid cooling of carriers in the low-fluence (single electron-hole pair per nanocrystal) regime. Intraband relaxation processes, as a function of excitation energy, size, and temperature are broadly consistent with other nanocrystalline semiconductor materials.},
doi = {10.1002/adfm.201901725},
journal = {Advanced Functional Materials},
number = 37,
volume = 29,
place = {United States},
year = {2019},
month = {7}
}

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