TY - GEN
T1 - The effect on thermoelectric properties of Cd substitution in PbTe
AU - Ahn, Kyunghan
AU - Han, Mi Kyung
AU - Vermeulen, Derek
AU - Moses, Steven
AU - Uher, Ctirad
AU - Kanatzidis, Mercouri G.
PY - 2009/12/1
Y1 - 2009/12/1
N2 - A recent theoretical study suggested that the substitution of Cd in PbTe can result in a distortion in the electronic density of states (DOS) near the bottom of the conduction band in PbTe. In this study we explored the effect of Cd doping on the thermoelectric properties of PbTe in an effort to test the theoretical prediction that DOS distortion can increase the Seebeck coefficient. We present detailed investigation of structural and spectroscopic data, transmission electron microscopy, as well as transport properties of samples of PbI2 doped PbTe-x% CdTe (x = 1, 3, 5, 7, 10). All samples follow the Pisarenko relationship and no enhancement of the Seebeck coefficient was observed due to DOS distortions. A low lattice thermal conductivity was achieved by nanostructuring observed via high resolution transmission electron microscopy. A maximum ZT of ∼1.2 at ∼720 K was achieved for the 1% CdTe sample.
AB - A recent theoretical study suggested that the substitution of Cd in PbTe can result in a distortion in the electronic density of states (DOS) near the bottom of the conduction band in PbTe. In this study we explored the effect of Cd doping on the thermoelectric properties of PbTe in an effort to test the theoretical prediction that DOS distortion can increase the Seebeck coefficient. We present detailed investigation of structural and spectroscopic data, transmission electron microscopy, as well as transport properties of samples of PbI2 doped PbTe-x% CdTe (x = 1, 3, 5, 7, 10). All samples follow the Pisarenko relationship and no enhancement of the Seebeck coefficient was observed due to DOS distortions. A low lattice thermal conductivity was achieved by nanostructuring observed via high resolution transmission electron microscopy. A maximum ZT of ∼1.2 at ∼720 K was achieved for the 1% CdTe sample.
UR - http://www.scopus.com/inward/record.url?scp=74549219366&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=74549219366&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:74549219366
SN - 9781605111391
T3 - Materials Research Society Symposium Proceedings
SP - 177
EP - 182
BT - Materials and Devices for Thermal-to-Electric Energy Conversion
T2 - 2009 MRS Spring Meeting: Materials and Devices for Thermal-to-Electric Energy Conversion
Y2 - 13 April 2009 through 17 April 2009
ER -