Volume 8, Issue 3 (10-2018)                   JEM 2018, 8(3): 0-0 | Back to browse issues page

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Mohamadi M, Mehrabian M A, Raisi A. Improving the efficiency of the solid-state energy conversion by means of thermoelectric nanostructures. JEM. 2018; 8 (3)
URL: http://energy.kashanu.ac.ir/article-1-758-en.html
Shahid Bahonar Kerman University
Abstract:  

solid-state energy conversion technologies such as thermoelectric refrigeration and power generation require materials with low thermal conductivity but high electrical conductivity and Seebeck coefficient. Although semiconductors are the best thermoelectric materials, they rarely have the mentioned properties. Nanostructures such as superlattices, quantum wires and quantum dots provide novel methods to improve the solid-state energy conversion efficiency through electron and phonon transport engineering. In this work a semiconducting superlattice has been studied consisting of periodic nano layers of sillicon and germanium. Due to nano scale effects, conductive heat transfer does not satisfy Fourier's law of thermal conduction. The equation of phonon radiative transfer has been solved numerically. The results show that the thermal conductivity of the nano structure is much lower than the macro suructures with the same aspect ratio. It is also noticed that with constant ratio of layers thickness, more reduction in layers thickness causes more temperature jump at interfaces and consequently more reduction in effective thermal conductivity that finally improves the thermoelectric properties. The results show that the effective thermal conductivity depends on the density of interfaces per unit length.

     
Type of Study: Research | Subject: Mechanical Engineering

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