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 › Research › peer-review

1 Citation (Scopus)

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
Externally published	Yes

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10.1039/c6cp06532e

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title = "Seeing the invisible plasma with transient phonons in cuprous oxide",

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.",

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AU - Frazer, Laszlo

AU - Schaller, Richard D.

AU - Chang, Kelvin B.

AU - Chernatynskiy, Aleksandr

AU - Poeppelmeier, Kenneth R.

PY - 2017

Y1 - 2017

N2 - 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.

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.

UR - https://www.scopus.com/pages/publications/85008957422

U2 - 10.1039/c6cp06532e

DO - 10.1039/c6cp06532e

M3 - Article

SN - 1463-9076

VL - 19

SP - 1151

EP - 1157

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

IS - 2

ER -

Seeing the invisible plasma with transient phonons in cuprous oxide

Abstract

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