【摘 要】
：
It is known that p-type GeTe-based materials show excellent thermoelectric performance due to the favorable electronic band structure.However,n-type doping in GeTe is of challenge owing to the native Ge vacancies and high hole concentration of about 1021
【机 构】
：
School of Materials Science and Engineering,and State Key Laboratory of Silicon Materials,Zhejiang U
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It is known that p-type GeTe-based materials show excellent thermoelectric performance due to the favorable electronic band structure.However,n-type doping in GeTe is of challenge owing to the native Ge vacancies and high hole concentration of about 1021 cm-3.In the present work,the formation energy of cation vacancies of GeTe is increased through alloying PbSe,and further Bi-doping enables the change of carrier conduction from p-type to n-type.As a result,the n-type thermoelectric performance is obtained in GeTe-based materials.A peak zT of 0.34 at 525 K is obtained for (Ge0.6Pb0.4)0.88Bi0.12Te0.6Se0.4.These results highlight the realization of n-type doping in GeTe and pave the way for further optimization of the thermoelectric performance of n-type GeTe.
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