Contrasting Thermoelectric Transport Behaviors of p -Type PbS Caused by Doping Alkali Metals (Li and Na)
Year: 2020
Type: article
Abstract: PbS is a latent substitute of PbTe thermoelectric materials, which is on account of its superiority in low cost and earth abundance. Here, the thermoelectric transport properties of p -type PbS by doping alkali metals (Na and Li) are investigated and it is verified that Li is a more effective dopant than Na. By introducing Li, the electrical and thermal transport properties were optimized collectively. The electrical transport properties were boosted remarkably via adjusting carrier concentration, and the maximum power factor (PF max ) of ~11.5 μ W/cmK 2 and average power factor (PF ave ) ~9.9 μ W/cmK 2 between 423 and 730 K in Pb 0.99 Li 0.01 S were achieved, which are much higher than those (~9.5 and ~7.7 μ W/cmK 2 ) of Pb 0.99 Na 0.01 S. Doping Li and Na can weaken the lattice thermal conductivity effectively. Combining the enlarged PF with suppressed total thermal conductivity, a maximum ZT ~0.5 at 730 K and a large average ZT ~0.4 at 423-730 K were obtained in p -type Pb 0.99 Li 0.01 S, which are higher than ~0.4 and ~0.3 in p -type Pb 0.99 Na 0.01 S, respectively.
Source: Research
Institutions: Beihang University, Henan Normal University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,500
Funders: Henan Normal University, National Natural Science Foundation of China, Beihang University, China Postdoctoral Science Foundation, Higher Education Discipline Innovation Project, National Postdoctoral Program for Innovative Talents, National Key Research and Development Program of China, Academic Excellence Foundation of BUAA for PHD Students, National Science Fund for Distinguished Young Scholars
OpenAlex ID: W3107952546