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ACS Appl Mater Interfaces. 2019 Mar 27;11(12):12027-12031. doi: 10.1021/acsami.8b21003. Epub 2019 Mar 14.

Thermoelectric Enhancement of Silicon Membranes by Ultrathin Amorphous Films.

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Institute of Industrial Science , The University of Tokyo , Tokyo 153-8505 , Japan.
PRESTO , Japan Science and Technology Agency , Saitama 332-0012 , Japan.


We propose a simple, low-cost, and large-area method to increase the thermoelectric figure of merit (ZT) in silicon membranes by the deposition of an ultrathin aluminum layer. Transmission electron microscopy showed that short deposition of aluminum on a silicon substrate covers the surface with an ultrathin amorphous film, which, according to recent theoretical works, efficiently destroys phonon wave packets. As a result, we measured 30-40% lower thermal conductivity in silicon membranes covered with aluminum films while the electrical conductivity was not affected. Thus, we have achieved 40-45% higher ZT values in membranes covered with aluminum films. To demonstrate a practical application, we applied this method to enhance the performance of a silicon membrane-based thermoelectric device and measured 42% higher power generation.


figure of merit; phonon engineering; silicon; thermal conductivity; thermoelectrics


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