4 years ago

Significantly Enhanced Thermoelectric Performance of γ-In2Se3 through Lithiation via Chemical Diffusion

Significantly Enhanced Thermoelectric Performance of γ-In2Se3 through Lithiation via Chemical Diffusion
Zhiliang Song, Jiaolin Cui, Yimin Chao, Gang Chen, Zhengliang Du, Hua Peng
γ-In2Se3 is selected as a thermoelectric candidate because it has a unique crystal structure and thermal stability at relatively high temperatures. In this work, we have prepared lithiated γ-In2Se3 through chemical diffusion and investigated its band structures and thermoelectric performance. After lithiation of γ-In2Se3 in a lithium acetate (CH3COOLi) solution at 50 °C for 30 h, we have observed a high Hall carrier concentration (nH) of ≤1.71 × 1018 cm–3 at room temperature, which is ∼4 orders of magnitude higher than that of pristine γ-In2Se3. The enhancement of nH is directly responsible for the remarkable improvement in electrical conductivity and can be elucidated as the Fermi level (Fr) unpinning and moving toward the conduction band through the dominant interstitial occupation of Li+ in the γ-In2Se3 lattice. Combined with the minimum lattice thermal conductivity (κL = 0.30–0.34 W K–1 m–1) at ∼923 K, the highest ZT value of 0.62–0.67 is attained, which is approximately 9–10 times that of pristine γ-In2Se3, proving that the lithiation in γ-In2Se3 is an effective approach to the improvement in thermoelectric performance.

Publisher URL: http://dx.doi.org/10.1021/acs.chemmater.7b02467

DOI: 10.1021/acs.chemmater.7b02467

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