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Transient Harman Measurement of the Cross-plane ZT of InGaAs/InGaAlAs Superlattices with Embedded ErAs Nanoparticles

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Abstract

The transient Harman technique is used to characterize the cross-plane ZT of InGaAs/InGaAlAs superlattice structures with embedded ErAs nanoparticles in the well layers. ErAs nanoparticles have proven to substantially reduce the thermal conductivity while slightly increasing the electrical conductivity of bulk InGaAs. The InGaAs/InGaAlAs superlattice structure was designed to have a barrier height of approximately 200meV. Although ErAs nanoparticles provide free carriers inside the semiconductor matrix, additional doping with Si increased the Fermi energy to just below the barrier height. The bipolar transient Harman technique was used to measure device ZT of samples with different superlattice thicknesses in order to extract the intrinsic cross-plane ZT of the superlattice by eliminating the effects of device Joule heating and parasitics. High-speed packaging is used to reduce signal ringing due to electrical impedance mismatch and achieve a short time resolution of roughly 100ns in transient Seebeck voltage measurement. The measured intrinsic cross-plane ZT of the superlattice structure is 0.13 at room temperature. This value agrees with calculations based on the Boltzmann transport equation and direct measurements of specific film properties. Theoretical calculations predict cross-plane ZT of the superlattice to be greater than 1 at temperatures greater than 700K.

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Authors and Affiliations

  1. Electrical Engineering Department, University of California, 95064, Santa Cruz, CA, USA

    Rajeev Singh, Zhixi Bian, Gehong Zeng, Joshua Zide, James Christofferson, Hsu-Feng Chou, Art Gossard, John Bowers & Ali Shakouri

  2. Department of Electrical and Computer Engineering, University of California, 93106, Santa Barbara, CA, USA

    Ali Shakouri

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  1. Rajeev Singh
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  2. Zhixi Bian
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  3. Gehong Zeng
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  4. Joshua Zide
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  5. James Christofferson
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  6. Hsu-Feng Chou
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  7. Art Gossard
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  8. John Bowers
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  9. Ali Shakouri
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Singh, R., Bian, Z., Zeng, G. et al. Transient Harman Measurement of the Cross-plane ZT of InGaAs/InGaAlAs Superlattices with Embedded ErAs Nanoparticles. MRS Online Proceedings Library 886, 404 (2005). https://doi.org/10.1557/PROC-0886-F04-04

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  • DOI: https://doi.org/10.1557/PROC-0886-F04-04

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