TY - JOUR
T1 - Insights into the Classification of Nanoinclusions of Composites for Thermoelectric Applications
AU - Theja, Vaskuri C.S.
AU - Karthikeyan, Vaithinathan
AU - ASSI, Dani Samer
AU - Roy, Vellaisamy A.L.
N1 - Publisher Copyright:
© 2016 American Chemical Society.
PY - 2022/10/25
Y1 - 2022/10/25
N2 - Thermoelectric composites are known for their enhanced power conversion performance via interfacial engineering and intensified mechanical, structural, and thermal properties. However, the selection of these nanoinclusions, for example, their type, size effect, volume fraction, distribution uniformity, coherency with host, carrier dynamics, and physical stability, plays a crucial role in modifying the host material thermoelectric properties. In this Review, we classify the nanoinclusions into five types: carbon allotropes, secondary thermoelectric phases, metallic materials, insulating oxides, and others. On the basis of the classification, we discuss the mechanisms involved in improving the ZT of nanocomposites involving reduction of thermal conductivity (κ) by phonon scattering, improving the Seebeck coefficient (α) via energy filtering effect and the electrical conductivity (σ) by carrier injection or carrier channeling. Comprehensibly, we validate that adding nanoinclusions with high electrical and low thermal conductivity as compared to the matrix material is the best way to optimize the interlocked thermoelectric parameters. Thus, collective doping and nanoinclusions in thermoelectric materials is the best possible solution to achieve a higher power conversion efficiency equivalent to other renewable energy technologies.
AB - Thermoelectric composites are known for their enhanced power conversion performance via interfacial engineering and intensified mechanical, structural, and thermal properties. However, the selection of these nanoinclusions, for example, their type, size effect, volume fraction, distribution uniformity, coherency with host, carrier dynamics, and physical stability, plays a crucial role in modifying the host material thermoelectric properties. In this Review, we classify the nanoinclusions into five types: carbon allotropes, secondary thermoelectric phases, metallic materials, insulating oxides, and others. On the basis of the classification, we discuss the mechanisms involved in improving the ZT of nanocomposites involving reduction of thermal conductivity (κ) by phonon scattering, improving the Seebeck coefficient (α) via energy filtering effect and the electrical conductivity (σ) by carrier injection or carrier channeling. Comprehensibly, we validate that adding nanoinclusions with high electrical and low thermal conductivity as compared to the matrix material is the best way to optimize the interlocked thermoelectric parameters. Thus, collective doping and nanoinclusions in thermoelectric materials is the best possible solution to achieve a higher power conversion efficiency equivalent to other renewable energy technologies.
KW - energy filtering
KW - nanocomposites
KW - nanoinclusion
KW - phonon scattering
KW - thermoelectrics
UR - http://www.scopus.com/inward/record.url?scp=85139478364&partnerID=8YFLogxK
U2 - 10.1021/acsaelm.2c00617
DO - 10.1021/acsaelm.2c00617
M3 - Review article
AN - SCOPUS:85139478364
VL - 4
SP - 4781
EP - 4796
JO - ACS Applied Electronic Materials
JF - ACS Applied Electronic Materials
IS - 10
ER -