1 Ocak 2016 Dergi makalesi Açık Erişim

Li, Guodong; Bajaj, Saurabh; Aydemir, Umut; Hao, Shiqiang; Xiao, Hai; Goddard, William A., III; Zhai, Pengcheng; Zhang, Qingjie; Snyder, G. Jeffrey

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    <subfield code="a">p-Type Co Interstitial Defects in Thermoelectric Skutterudite CoSb3 Due to the Breakage of Sb-4-Rings</subfield>
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    <subfield code="a">Skutterudite CoSb3 based thermoelectric devices have high potential for engineering applications because both nand p-type doped CoSb3 demonstrate excellent thermoelectric performance. A crucial point concerning the application of CoSb3 is to understand and control its defect chemistry. To reveal the native conductivity behavior of nonstoichiometric CoSb3, we investigated the intrinsic point defects in CoSb3 using density functional theory. We found CoSb3 is p-type in either Co or Sb rich regions of phase stability. Interstitial Co (Co-i) and interstitial Co-pair (Coi-p) are the dominant point defects in the Co rich region. However, Coi-p will be difficult to form because the formation temperature of Coi-p is much lower than the synthesis temperature of CoSb3. The unexpected acceptor nature of the Co-i or Coi-p defects is explained by the breakage of multiple Sb-4-rings. Co vacancy (Co-y) is found to be the p-type defect in the Sb rich region. Furthermore, the solubility of excess Co in CoSb3 is expected to be larger than that of Sb because of the lower formation energy and higher carrier concentration of Co-i compared with those of Co-v.</subfield>
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    <subfield code="u">Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Environm Energy &amp; Technol Div, Berkeley, CA 94720 USA</subfield>
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