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 - Jan 1 2017 |
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry
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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