Synergetic Tuning of the Electrical and Thermal Transport Properties via Pb/Ag Dual Doping in BiCuSeO

• DOI: 10.1021/acsami.9b16723
• Publication Date: 2019-11-18T20:56:20Z
• Authors: Fu Li; Zhuanghao Zheng; Yi Chang; Min Ruan; Zhenhua Ge; Yuexing Chen; Ping Fan
• Keywords: Phonon scattering

The influence of Pb/Ag dual doping on the thermoelectric performance BiCuSeO was investigated. It reveals that electrical conductivity can be obviously improved owing to increased carrier concentration mostly caused by divalent Pb2+ at trivalent Bi3+. improves from 7.29 S/cm for 397.40 Pb0.06Bi0.94Cu0.94Ag0.06SeO and Pb0.06Bi0.94CuSeO 327 K. Combined with moderate Seebeck coefficient (>120 μV/K) due large effective mass, a power factor 834 μW/mK2 is achieved. Meanwhile, lattice thermal visibly decreased, mainly benefiting substitution Ag+ Cu+ site since phonon scattering enhanced mass fluctuation strain between two elements. Thus, total suppressed effectively compared Ag-free sample Pb0.06Bi0.94CuSeO. Finally, maximum ZT value nearly 1.0 has been obtained 873 K, which ∼64% ∼47% larger than those pristine Additionally, also reported Pb-free samples BiCu0.94Ag0.06SeO Bi0.92Ag0.08CuSeO, suggesting Pb Ag are codopants synergetically tune its transport properties.