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Driving perpendicular heat flow: (p×n)-type transverse thermoelectrics for microscale and cryogenic Peltier cooling
Chuanle Zhou1, S Birner, Yang Tang
1Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208, USA.
Abstract:
Whereas thermoelectric performance is normally limited by the figure of merit ZT, transverse thermoelectrics can achieve arbitrarily large temperature differences in a single leg even with inferior ZT by being geometrically tapered. We introduce a band-engineered transverse thermoelectric with p-type Seebeck in one direction and n-type orthogonal, resulting in off-diagonal terms that drive heat flow transverse to electrical current. Such materials are advantageous for microscale devices and cryogenic temperatures--exactly the regimes where standard longitudinal thermoelectrics fail. InAs/GaSb type II superlattices are shown to have the appropriate band structure for use as a transverse thermoelectric.
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