Impact of Sm alloying and thermal annealing on the structural and thermoelectric properties of (GeTe)0.85(Pb1-Sm Te)0.15 alloys

Li, Junqin; Zhang, Chunxiao; Deng, Jiaojiao; Liu, Fusheng; Ao, W.Q.; Liu, Yu

doi:10.1016/j.jallcom.2018.04.317

Cited by 7 publications

(1 citation statement)

References 42 publications

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“…The elevated TE performance of Pb-and CuSbSe 2 -alloyed GeTe samples outperforms other GeTe-based thermoelectric materials, as shown in Figure S3 (Supporting Information). [46,48,[59][60][61][62][63][64]…”

Section: Thermoelectric Performance In Ge 0925 Pb 0075 Te With Alloyi...mentioning

confidence: 99%

Electrical and Thermal Transport Properties of Ge_1–_xPb_xCu_ySb_yTeSe₂_y

Jin

Ren

Qiu

et al. 2023

Adv Funct Materials

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Balancing the contradictory relationship between thermoelectric parameters, such as effective mass and carrier mobility, is a challenge to optimize thermoelectric performance. Herein, the exceptional thermoelectric performance is realized in GeTe through collaboratively optimizing the carrier and phonon transport via stepwise alloying Pb and CuSbSe2. The formation energy of Ge vacancy is efficiently bolstered by alloying Pb, which reduces carrier density and carrier scattering to maintain superior carrier mobility in GeTe. Additionally, CuSbSe2, acting as an n‐type dopant, further modulates carrier density and validly equilibrates carrier mobility and effective mass. Accordingly, the promising power factor of 45 µW cm−1 K−2 is achieved at 723 K. Meanwhile, point defects are found to significantly suppress phonons transport to descend lattice thermal conductivity by Pb and CuSbSe2 alloying, which barely impacts the carrier mobility. A combination with superior carrier mobility and lower lattice thermal conductivity, a maximum ZT of 2.2 is attained in Ge0.925Pb0.075Cu0.005Sb0.005TeSe0.01, which corresponds to a 100% promotion compared with that of intrinsic GeTe. This study provides a new indicator for optimizing carrier and phonon transport properties by balancing interrelated thermoelectric parameters.

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