Seeing the invisible plasma with transient phonons in cuprous oxide

Laszlo Frazer, Richard D Schaller, Kelvin B. Chang, Aleksandr Chernatynskiy, Kenneth R Poeppelmeier

Research output: Contribution to journalArticle

Abstract

The emission of phonons from electron-hole plasma is the primary limit on the efficiency of photovoltaic devices operating above the bandgap. In cuprous oxide (Cu2O) there is no luminescence from electron-hole plasma. Therefore, we searched for optical phonons emitted by energetic charge carriers using phonon-to-exciton upconversion transitions. We found 14 meV phonons with a lifetime of 0.916 ± 0.008 ps and 79 meV phonons that are longer lived and overrepresented. It is surprising that the higher energy phonon has a longer lifetime.

Original languageEnglish
Pages (from-to)1151-1157
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume19
Issue number2
DOIs
Publication statusPublished - 2017

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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