Interface Characterization of Cobalt Contacts on Bismuth Selenium Telluride for Thermoelectric Devices
KAUST DepartmentMaterials Science and Engineering Program
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AbstractSputtered Co is investigated as a suitable contact metal for bulk Bi2 (Te,Se) 3, and the results are compared to sputtered Ni. The coefficient of thermal expansion of Co matches that of bulk Bi 2 (Te,Se) 3 used in our study, and the compatible interface favors the selection of Co as a contact metal. Significant Ni diffusion into Bi2 (Te,Se) 3 was observed. In contrast, Co on Bi2 (Te,Se) 3 shows significantly less diffusion, even at anneal temperatures as high as 200°C. CoTe2 is the preferred phase that is formed. First principles calculations for Bi2 Te 3 support the experimental observation. © 2009 The Electrochemical Society.
CitationInterface Characterization of Cobalt Contacts on Bismuth Selenium Telluride for Thermoelectric Devices 2009, 12 (10):H395 Electrochemical and Solid-State Letters
PublisherThe Electrochemical Society