  In this letter, we explore electron filtering as a technique to increase
Seebeck coefficient and the thermoelectric power factor of heterostructured
materials over that of the bulk. We present a theoretical model in which
Seebeck coefficient and the power factor can be increased in an InGaAs based
composite material. Experimental measurements of the cross-plane Seebeck
coefficient are presented and confirm the importance of the electron filtering
technique to decouple the electrical conductivity and Seebeck coefficient to
increase the thermoelectric power factor.
