“…4,5 Bi 0.5 Sb 1.5 Te 3 is the best-known p-type material for room-temperature refrigeration. 6 Nano-structured Bi 2 Te 3based materials, such as thin films, 7 thick films, 8,9 and nanoscale inclusions in bulk materials, 10 can be fabricated by methods such as metal-organic chemical vapor deposition (MOCVD), 11 molecular beam epitaxy (MBE), 12 ion track lithography, 13 flash evaporation (FE), 14 spark plasma sintering (SPS) 15 and hot pressing. 16 Furthermore, the ZT value can be enhanced by controlling the preferential direction.…”