Antimony as an amphoteric dopant in lead telluride
| Title | Antimony as an amphoteric dopant in lead telluride |
| Publication Type | Journal Article |
| Year of Publication | 2009 |
| Authors | Jaworski CM, Tobola J, Levin EM, Schmidt-Rohr K, Heremans JP |
| Journal Title | Physical Review B |
| Volume | 80 |
| Pages | 125208 |
| Date Published | 09/01 |
| ISBN Number | 1098-0121 |
| Accession Number | ISI:000270383300064 |
| Keywords | alloys, chalcogenides, density-of-states, electronic-structure, pbse, pbte |
| Abstract | We elucidate the amphoteric nature of antimony as a dopant in PbTe. Band-structure calculations show that Sb substituting for Pb is a donor and that Sb on the Te site is an acceptor giving rise to a large excess density of states (DOS). Experimentally, in Te-rich Pb1-xSbxTe samples, Te-125 NMR spectroscopy shows that Sb substitutes for Pb and transport data reveal that it then acts as a simple donor. In Pb-rich PbSbxTe1-x samples, Te-125 NMR shows that little Sb substitutes for Te when samples are prepared above 770 K and then quenched; Pb-207 NMR shows four types of charge carriers, but only a majority hole and a minority electron contribute to transport. Sb acts as an acceptor in PbSbxTe1-x, but the large DOS calculated must correspond to a large concentration of localized holes and the Seebeck coefficient is not enhanced. |
| URL | <Go to ISI>://000270383300064 |
| DOI | 10.1103/Physrevb.80.125208 |
