Tuning carrier type and density in Bi2Se3 by Ca-doping

Zhiyong Wang; Tao Lin; Peng Wei; Xinfei Liu; Dumas, Randy; Kai Liu; Jing Shi
July 2010
Applied Physics Letters;7/26/2010, Vol. 97 Issue 4, p042112
Academic Journal
The carrier type and density in Bi2Se3 single crystals are systematically tuned by introducing a calcium (Ca) dopant. A carrier density of ∼1×1017 cm-3 which corresponds to ∼25 meV in the Fermi energy is obtained in both n- and p-type materials. Electrical transport properties show that the insulating behavior is achieved in low carrier density crystals. In addition, both the band gap and reduced effective mass of carriers are determined.


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