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.
UR - http://www.scopus.com/inward/record.url?scp=85008957422&partnerID=8YFLogxK
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 -
