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 | |
| Publication status | Published - 2017 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry
Cite this
Seeing the invisible plasma with transient phonons in cuprous oxide. / Frazer, Laszlo; Schaller, Richard D; Chang, Kelvin B.; Chernatynskiy, Aleksandr; Poeppelmeier, Kenneth R.
In: Physical Chemistry Chemical Physics, Vol. 19, No. 2, 2017, p. 1151-1157.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Seeing the invisible plasma with transient phonons in cuprous oxide
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.
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U2 - 10.1039/c6cp06532e
DO - 10.1039/c6cp06532e
M3 - Article
VL - 19
SP - 1151
EP - 1157
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 2
ER -