Defects Engineering with Multiple Dimensions in Thermoelectric Materials
Planar defects and related physical effect in thermoelectric materials. (a) Hall mobility and carrier concentration of single crystals and polycrystalline materials with different grain sizes in Bi2Te3-based alloys. Data are from Ref. [62, 115–119]. (b) Temperature-dependent lattice thermal conductivity of Bi2Te3-based alloys. Data are from Ref. [18, 117, 119, 121]. (c) TEM images showing the clean grain boundaries of Bi0.5Sb1.5Te3 nanograins . Reproduced with permission from the American Association for the Advancement of Science. (d) TEM image, SAED image, and simulated crystal structure of (BiS)1.2(TiS2)2 showing the stack faults . (e) Temperature-dependent lattice thermal conductivity of TiS2 and (MS)1+(TiS2)2 (M = Pb, Sn, and Bi) . Reproduced with permission from AIP Publishing.