TY - JOUR
T1 - Enhanced thermoelectric performance of TiS2 via large thermal conductivity reduction by solid solution alloying with TiSe2
AU - Park, Sanghyun
AU - Roh, Jong Wook
AU - Park, Joontae
AU - Cho, Hyungyu
AU - Kang, Seung Min
AU - Park, Okmin
AU - Kim, Hyun Sik
AU - Kim, Sang Il
N1 - Publisher Copyright:
© The Korean Ceramic Society 2024.
PY - 2024/3
Y1 - 2024/3
N2 - TiS2 is a transition metal dichalcogenide with semiconducting transport properties, and is considered a potential thermoelectric material owing to its relatively low lattice thermal conductivity originated from van der Waals stacking. In this study, the evolution of electrical and thermal transport properties of TiS2 by solid solution alloying with TiSe2 are investigated systematically regarding thermoelectric properties. A series of solid solution compositions of Ti(S1 − xSex)2 (x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) polycrystalline samples was synthesized by a conventional solid-state reaction, wherein no secondary phase was formed. As x increased, the electrical conductivity and carrier concentration gradually increased, while the Seebeck coefficient decreased. Consequently, the power factor decreased. On the other hand, the lattice thermal conductivity is reduced largely to 0.96 W/mK for x = 0.5 at 300 K, compared to 2.3 W/mK for the pristine TiS2 sample. Consequently, the thermoelectric figure of merit zT of TiS2 was enhanced by solid solution allying with TiSe2, despite deterioration of the electrical transport properties. The maximum zT of 0.41 was observed for x = 0.4 (Ti(S0.6Se0.4)2) at 500 K.
AB - TiS2 is a transition metal dichalcogenide with semiconducting transport properties, and is considered a potential thermoelectric material owing to its relatively low lattice thermal conductivity originated from van der Waals stacking. In this study, the evolution of electrical and thermal transport properties of TiS2 by solid solution alloying with TiSe2 are investigated systematically regarding thermoelectric properties. A series of solid solution compositions of Ti(S1 − xSex)2 (x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) polycrystalline samples was synthesized by a conventional solid-state reaction, wherein no secondary phase was formed. As x increased, the electrical conductivity and carrier concentration gradually increased, while the Seebeck coefficient decreased. Consequently, the power factor decreased. On the other hand, the lattice thermal conductivity is reduced largely to 0.96 W/mK for x = 0.5 at 300 K, compared to 2.3 W/mK for the pristine TiS2 sample. Consequently, the thermoelectric figure of merit zT of TiS2 was enhanced by solid solution allying with TiSe2, despite deterioration of the electrical transport properties. The maximum zT of 0.41 was observed for x = 0.4 (Ti(S0.6Se0.4)2) at 500 K.
KW - Solid solution alloying
KW - Thermal conductivity reduction
KW - Thermoelectric
KW - TiS
UR - http://www.scopus.com/inward/record.url?scp=85182440743&partnerID=8YFLogxK
U2 - 10.1007/s43207-024-00368-y
DO - 10.1007/s43207-024-00368-y
M3 - Article
AN - SCOPUS:85182440743
SN - 1229-7801
VL - 61
SP - 335
EP - 341
JO - Journal of the Korean Ceramic Society
JF - Journal of the Korean Ceramic Society
IS - 2
ER -