Intraband Cooling in All-Inorganic and Hybrid Organic–Inorganic Perovskite Nanocrystals

Benjamin T. Diroll, Richard D. Schaller*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


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. 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.

Original languageEnglish (US)
Article number1901725
JournalAdvanced Functional Materials
Issue number37
StatePublished - Sep 1 2019


  • hot carriers
  • intraband
  • nanocrystals
  • perovskites

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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