Enhanced thermoelectric properties of bismuth intercalated compounds Bi_xTiS_2

摘要

The thermoelectric properties of Bi intercalated compounds Bi_xTiS_2 have been investigated at the temperatures from 5 to 310 K. The results indicate that Bi intercalation into TiS_2 leads to substantial decrease of its electrical resistivity (one order low for x=0.05 and two orders low for x = 0.15, 0.25 at 300 K) and lattice thermal conductivity (22, 115 and 158% low at 300 K for x=0.05, 0.15 and 0.25, respectively). Specially, the figure of merit, ZT, of lightly intercalated compound Bi_(0.05)TiS_2 has been improved at all temperatures investigated, and specifically reaches 0.03 at 300 K, which is about twice as large as that of TiS_2.