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

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms13174· OSTI ID:1393401
ORCiD logo [1];  [2];  [2]; ORCiD logo [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Mechanical Engineering
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Chemistry

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 in this paper, 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.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-09ER46577; SC0001299
OSTI ID:
1393401
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Sb induces both doping and precipitation for improving the thermoelectric performance of elemental Te journal January 2017
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Propagation of THz acoustic wave packets in GaN at room temperature journal February 2018
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Effect of stacking faults and surface roughness on the thermal conductivity of InAs nanowires journal November 2018
Coherent acoustic phonon dynamics in chiral copolymers journal November 2019
Advances in thermoelectrics journal April 2018
Intrinsic electronic transport and thermoelectric power factor in n-type doped monolayer MoS 2 journal April 2018
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