Abstract
The unique layered structure and intrinsically low lattice thermal conductivity of ternary compound PbBi4Te7 have rendered it a promising thermoelectric material. However, the bipolar diffusion effect induced by inherent excitation results in deteriorated Seebeck coefficients and amplified thermal conductivity. In this study, the bipolar diffusion effect of PbBi4Te7 is effectively suppressed through enlarging the bandgap via Se alloying, thereby facilitating its potential application as a complementary counterpart to p-type materials. A maximum ZT value of ∼0.67 is achieved in PbBi4(Te0.7Se0.3)7 at 723 K, signifying an impressive improvement of 121 % compared to pure PbBi4Te7. This study provides a novel insight into enhancing the thermoelectric performance of ternary materials.
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