Seeing the Invisible Plasma with Transient Phonons in Cuprous Oxide
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.
L. Frazer et al., "Seeing the Invisible Plasma with Transient Phonons in Cuprous Oxide," Physical Chemistry Chemical Physics, vol. 19, no. 2, pp. 1151-1157, Royal Society of Chemistry, Feb 2017.
The definitive version is available at https://doi.org/10.1039/c6cp06532e
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01 Feb 2017