Lead telluride

• Dielectric constant ~1000.
• Electron Effective mass ~ 0.01m_e
• Hole mobility, μ_p = 600 cm² V⁻¹ s⁻¹ (0 K); 4000 cm² V⁻¹ s⁻¹ (300 K)
• Seebeck coefficient: ~326 μV/K (undoped, at 300K), ~200 μV/K (Ag-doped){{Cite journal |last=Martin |first=J. |last2=Wang |first2=Li |last3=Chen |first3=Lidong |last4=Nolas |first4=G. S. |date=2009-03-13 |title=Enhanced Seebeck coefficient through energy-barrier scattering in PbTe nanocomposites |url=https://journals.aps.org/prb/abstract/10.1103/PhysRevB.79.115311 |journal=Physical Review B |volume=79 |issue=11 |pages=115311 |doi=10.1103/PhysRevB.79.115311|url-access=subscription }}

PbTe has proven to be a very important intermediate thermoelectric material. The performance of thermoelectric materials can be evaluated by the figure of merit, $ZT=S^2\backslash sigma\; T/\backslash kappa$, in which $S$ is the Seebeck coefficient, $\backslash sigma$ is the electrical conductivity and $\backslash kappa$ is the thermal conductivity. In order to improve the thermoelectric performance of materials, the power factor ($S^2\backslash sigma$) needs to be maximized and the thermal conductivity needs to be minimized.{{Cite journal

|title = High performance bulk thermoelectrics via a panoscopic approach|journal = Materials Today|date = 2013-05-01|pages = 166–176|volume = 16|issue = 5|doi = 10.1016/j.mattod.2013.05.004|first1 = Jiaqing|last1 = He|first2 = Mercouri G.|last2 = Kanatzidis|first3 = Vinayak P.|last3 = Dravid

|doi-access = free}}

The PbTe system can be optimized for power generation applications by improving the power factor via band engineering. It can be doped either n-type or p-type with appropriate dopants. Halogens are often used as n-type doping agents. PbCl₂, PbBr₂ and PbI₂ are commonly used to produce donor centers. Other n-type doping agents such as Bi₂Te₃, TaTe₂, MnTe₂, will substitute for Pb and create uncharged vacant Pb-sites. These vacant sites are subsequently filled by atoms from the lead excess and the valence electrons of these vacant atoms will diffuse through crystal. Common p-type doping agents are Na₂Te, K₂Te and Ag₂Te. They substitute for Te and create vacant uncharged Te sites. These sites are filled by Te atoms which are ionized to create additional positive holes.{{Cite journal

|title = Lead telluride as a thermoelectric material for thermoelectric power generation|journal = Physica B: Condensed Matter|date = 2002-09-01|pages = 205–223|volume = 322|issue = 1–2|doi = 10.1016/S0921-4526(02)01187-0|first = Z. H.|last = Dughaish

|bibcode = 2002PhyB..322..205D}} With band gap engineering, the maximum zT of PbTe has been reported to be 0.8 - 1.0 at ~650K.

Collaborations at Northwestern University boosted the zT of PbTe by significantly reducing its thermal conductivity using ‘all-scale hierarchical architecturing'.{{Cite journal|title = Strained endotaxial nanostructures with high thermoelectric figure of merit|journal = Nature Chemistry|date = 2011-02-01|issn = 1755-4330|pages = 160–166|volume = 3|issue = 2|doi = 10.1038/nchem.955|first1 = Kanishka|last1 = Biswas|first2 = Jiaqing|last2 = He|first3 = Qichun|last3 = Zhang|first4 = Guoyu|last4 = Wang|first5 = Ctirad|last5 = Uher|first6 = Vinayak P.|last6 = Dravid|first7 = Mercouri G.|last7 = Kanatzidis|pmid=21258390|bibcode = 2011NatCh...3..160B}} With this approach, point defects, nanoscale precipitates and mesoscale grain boundaries are introduced as effective scattering centers for phonons with different mean free paths, without affecting charge carrier transport. By applying this method, the record value for zT of PbTe that has been achieved in Na doped PbTe-SrTe system is approximately 2.2.{{Cite journal|title = High-performance bulk thermoelectrics with all-scale hierarchical architectures|journal = Nature|date = 2012-09-20|issn = 0028-0836|pages = 414–418|volume = 489|issue = 7416|doi = 10.1038/nature11439|first1 = Kanishka|last1 = Biswas|first2 = Jiaqing|last2 = He|first3 = Ivan D.|last3 = Blum|first4 = Chun-I.|last4 = Wu|first5 = Timothy P.|last5 = Hogan|first6 = David N.|last6 = Seidman|first7 = Vinayak P.|last7 = Dravid|first8 = Mercouri G.|last8 = Kanatzidis|pmid=22996556|bibcode = 2012Natur.489..414B|s2cid = 4394616}}

In addition, PbTe is also often alloyed with tin to make lead tin telluride, which is used as an infrared detector material.

• Yellow Duckling, which used a lead telluride sensor to make the first infrared linescan camera

{{More citations needed|date=May 2009}}

{{Reflist}}

• [https://web.archive.org/web/20080111154608/http://www.npi.gov.au/database/substance-info/profiles/50.html National Pollutant Inventory Lead and compounds fact sheet]
• [http://www.webelements.com/webelements/compounds/text/Pb/Pb1Te1-1314916.html Webelements]

{{Lead compounds}}

{{Tellurides}}

Category:Tellurides

Category:Lead(II) compounds

Category:IV-VI semiconductors

Category:Thermoelectricity

Category:Rock salt crystal structure