Effect of grain size on the thermoelectric conversion efficiency of semiconductor alloys at high temperature

摘要: Abstract The theoretical increase in the thermoelectric figure of merit silicon-germanium alloy at 1000 K which would accompany a reduction material grain size is calculated. Assuming that acoustic phonon scattering dominant mechanism, improvement conversion efficiency compared with single crystal values estimated to be 14 per cent and 30 for n -type Si 80 Ge 20 sizes 10 μm 0·1 μm, respectively.