Model To Determine a Distinct Rate Constant for Carrier Multiplication from Experiments

Frank Spoor, Gianluca Grimaldi, Sachin Kinge, Arjan Houtepen, Laurens Siebbeles

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
81 Downloads (Pure)

Abstract

Carrier multiplication (CM) is the process in which multiple electron–hole pairs are created upon absorption of a single photon in a semiconductor. CM by an initially hot charge carrier occurs in competition with cooling by phonon emission, with the respective rates determining the CM efficiency. Up until now, CM rates have only been calculated theoretically. We show for the first time how to extract a distinct CM rate constant from experimental data of the relaxation time of hot charge carriers and the yield of CM. We illustrate this method for PbSe quantum dots. Additionally, we provide a simplified method using an estimated energy loss rate to estimate the CM rate constant just above the onset of CM, when detailed experimental data of the relaxation time is missing.
Original languageEnglish
Pages (from-to)721-728
Number of pages8
JournalACS Applied Energy Materials
Volume2
Issue number1
DOIs
Publication statusPublished - 2019

Keywords

  • carrier multiplication
  • electron-hole pairs
  • quantum dots
  • quantum yield
  • semiconductor

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