论文信息 - Carrier Pocket Engineering to Design Superior Thermoelectric Materials Using GaAs/AlAs Superlattices

Carrier Pocket Engineering to Design Superior Thermoelectric Materials Using GaAs/AlAs Superlattices

A large enhancement in the thermoelectric figure of merit for the whole superlattice, Z 3D T , is predicted for short period GaAs/AlAs superlattices relative to bulk GaAs. Various superlattice parameters (superlattice growth direction, superlattice period and layer thicknesses) are explored to optimize Z 3D T , including quantum wells formed at various high symmetry points in the Brillouin zone. The highest room temperature Z 3D T obtained in the present calculation is 0.41 at the optimum carrier concentration for either (001) or (111) oriented GaAs(20 A)/AIAs(20 A) superlattices, which is about 50 times greater than the corresponding ZT for bulk GaAs obtained using the same basic model.

Takaaki Koga | Stephen B. Cronin | Mildred S. Dresselhaus | X. Sun

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