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

Benjamin T. Diroll, Richard D. Schaller

Research output: Contribution to journalArticle

8 Citations (Scopus)

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. 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
Article number1901725
JournalAdvanced Functional Materials
Volume29
Issue number37
DOIs
Publication statusPublished - Sep 1 2019

Keywords

  • hot carriers
  • intraband
  • nanocrystals
  • perovskites

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Intraband Cooling in All-Inorganic and Hybrid Organic–Inorganic Perovskite Nanocrystals'. Together they form a unique fingerprint.

  • Cite this