We characterize cross-plane and in-plane Seebeck coefficients for superlattices with different carrier concentrations using test patterns integrated with microheaters. The microheater creates a local temperature difference, and the cross-plane Seebeck coefficients of the superlattices are determined by a combination of experimental measurements and finite element simulations. The cross-plane Seebeck coefficients are compared to the in-plane Seebeck coefficients and a significant increase in the cross-plane Seebeck coefficient over the in-plane Seebeck coefficient is observed. Differences between cross-plane and in-plane Seebeck coefficients decrease as the carrier concentration increases, which is indicative of heterostructure thermionic emission in the cross-plane direction.
Cross-plane Seebeck coefficient of superlattices
Gehong Zeng, Joshua M. O. Zide, Woochul Kim, John E. Bowers, Arthur C. Gossard, Zhixi Bian, Yan Zhang, Ali Shakouri, Suzanne L. Singer, Arun Majumdar; Cross-plane Seebeck coefficient of superlattices. J. Appl. Phys. 1 February 2007; 101 (3): 034502. https://doi.org/10.1063/1.2433751
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