Superlattice structures particularly suitable for use as thermoe

Details Superlattice structures particularly suitable for use as thermoe Superlattice structures particularly suitable for use as thermoe

1993-01-12

1995-05-16

Walsh, Donald P.

Batteries: thermoelectric and photoelectric

Thermoelectric

Having particular thermoelectric composition

136225, 136240, 257 22, 257 42, 257467, 257470, 257930, H01L 3516

Patent

active

054156998

ABSTRACT:
A superlattice comprising alternating layers of (PbTeSe).sub.m and (BiSb).sub.n (where m and n are the number of PbTeSe and BiSb monolayers per superlattice period, respectively) having engineered electronic structures for improved thermoelectric cooling materials (and other uses) may be grown by molecular beam epitaxial growth. Preferably, for short periods, n+m<50. However, superlattice films with 10,000 or more such small periods may be grown. For example, the superlattice may comprise alternating layers of (PbTe.sub.1-z Se.sub.z).sub.m and (Bi.sub.x Sb.sub.1-x).sub.n. According to a preferred embodiment, the superlattice comprises a plurality of layers comprising m layers of PbTe.sub.0.8 Se.sub.0.2 and n layers of Bi.sub.0.9 Sb.sub.0.1, where m and n are preferably between 2 and 20.

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