Unknown

Dataset Information

0

Photo-excited charge carriers suppress sub-terahertz phonon mode in silicon at room temperature.


ABSTRACT: There is a growing interest in the mode-by-mode understanding of electron and phonon transport for improving energy conversion technologies, such as thermoelectrics and photovoltaics. Whereas remarkable progress has been made in probing phonon-phonon interactions, it has been a challenge to directly measure electron-phonon interactions at the single-mode level, especially their effect on phonon transport above cryogenic temperatures. Here we use three-pulse photoacoustic spectroscopy to investigate the damping of a single sub-terahertz coherent phonon mode by free charge carriers in silicon at room temperature. Building on conventional pump-probe photoacoustic spectroscopy, we introduce an additional laser pulse to optically generate charge carriers, and carefully design temporal sequence of the three pulses to unambiguously quantify the scattering rate of a single-phonon mode due to the electron-phonon interaction. Our results confirm predictions from first-principles simulations and indicate the importance of the often-neglected effect of electron-phonon interaction on phonon transport in doped semiconductors.

SUBMITTER: Liao B 

PROVIDER: S-EPMC5064017 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

altmetric image

Publications

Photo-excited charge carriers suppress sub-terahertz phonon mode in silicon at room temperature.

Liao Bolin B   Maznev A A AA   Nelson Keith A KA   Chen Gang G  

Nature communications 20161012


There is a growing interest in the mode-by-mode understanding of electron and phonon transport for improving energy conversion technologies, such as thermoelectrics and photovoltaics. Whereas remarkable progress has been made in probing phonon-phonon interactions, it has been a challenge to directly measure electron-phonon interactions at the single-mode level, especially their effect on phonon transport above cryogenic temperatures. Here we use three-pulse photoacoustic spectroscopy to investig  ...[more]

Similar Datasets

| S-EPMC4640140 | biostudies-literature
| S-EPMC3216602 | biostudies-literature
| S-EPMC4639799 | biostudies-other
| S-EPMC5524879 | biostudies-literature
| S-EPMC6546691 | biostudies-literature
| S-EPMC6538846 | biostudies-literature
| S-EPMC5437287 | biostudies-literature
| S-EPMC4432643 | biostudies-literature
| S-EPMC8012705 | biostudies-literature
| S-EPMC5823850 | biostudies-literature