Open AccessEnergy-filtering-induced high power factor in PbS-nanoparticles-embedded TiS2
Author(s) -
Yulong Wang,
Junfu Wen,
Zhenghua Fan,
Ningzhong Bao,
Rong Huang,
Rong Tu,
Yifeng Wang
Publication year - 2015
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4918687
Subject(s) - seebeck coefficient , materials science , power factor , thermoelectric effect , nanoparticle , band gap , ceramic , optoelectronics , conductivity , analytical chemistry (journal) , nanotechnology , power (physics) , thermal conductivity , chemistry , composite material , thermodynamics , physics , chromatography
We report on a greatly enhanced power factor for 1%PbS-nanoparticle-embedded TiS2 bulk ceramic, about 1 mW/(mK2) at 300 K and 1.23 mW/(mK2) in a wide temperature range of 573 ∼ 673 K, of which the latter is among the highest so far for TiS2-based thermoelectric materials. Compared to TiS2, the power factor is increased by ∼110% at 300 K and (50 ∼ 35)% at 573 ∼ 673 K. This enhancement is derived from a large increase in Seebeck coefficient which overwhelmed the modest degradation of electrical conductivity, which should be attributed to energy filtering induced by the band gap offset between TiS2 and PbS