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 (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.
- Authors:
-
[2]
- Argonne National Lab. (ANL), Lemont, IL (United States). Center for Nanoscale Materials
- 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 Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). 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. https://doi.org/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. https://doi.org/10.1002/adfm.201901725. https://www.osti.gov/servlets/purl/1574294.
@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 = {Wed Jul 17 00:00:00 EDT 2019},
month = {Wed Jul 17 00:00:00 EDT 2019}
}
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Figure 1: Time- and energy-resolved maps of transient absorption with 3.1 eV pump of representative (b) 9.7 nm CsPbBr3 and (b) 8.8 nm FAPbBr3 nanocrystals. (c, d) Normalized spectral line-cuts of the two-dimensional maps. (e, f) Kinetics of the excitonic bleach feature for a series of (e) CsPbBr3 and (f)more »
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