A thermoelectric device includes a nanocomposite material with nanowires of at least one thermoelectric material having a predetermined figure of merit, the nanowires being formed in a porous substrate having a low thermal conductivity and having an average pore diameter ranging from about 4 nm to about 300 nm.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
This invention was made in the course of research partially supported by a grant from the Department of Energy (DOE), Grant No. DE-FC26.sub.--04NT42278. The U.S. government has certain rights in the invention.