Seeing the invisible plasma with transient phonons in cuprous oxide

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

doi:10.1039/c6cp06532e

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 journal › Article

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 language	English
Pages (from-to)	1151-1157
Number of pages	7
Journal	Physical Chemistry Chemical Physics
Volume	19
Issue number	2
DOIs	https://doi.org/10.1039/c6cp06532e
Publication status	Published - 2017

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ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

Cite this

Frazer, L., Schaller, R. D., Chang, K. B., Chernatynskiy, A., & Poeppelmeier, K. R. (2017). Seeing the invisible plasma with transient phonons in cuprous oxide. Physical Chemistry Chemical Physics, 19(2), 1151-1157. https://doi.org/10.1039/c6cp06532e

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AB - 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.

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10.1039/c6cp06532e