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Title: Exploring packaging strategies of nano-embedded thermoelectric generators

Embedding nanostructures within a bulk matrix is an important practical approach towards the electronic engineering of high performance thermoelectric systems. For power generation applications, it ideally combines the efficiency benefit offered by low dimensional systems along with the high power output advantage offered by bulk systems. In this work, we uncover a few crucial details about how to embed nanowires and nanoflakes in a bulk matrix so that an overall advantage over pure bulk may be achieved. First and foremost, we point out that a performance degradation with respect to bulk is inevitable as the nanostructure transitions to a multi moded one. It is then shown that a nano embedded system of suitable cross-section offers a power density advantage over a wide range of efficiencies at higher packing fractions, and this range gradually narrows down to the high efficiency regime, as the packing fraction is reduced. Finally, we introduce a metric - the advantage factor, to elucidate quantitatively, the enhancement in the power density offered via nano-embedding at a given efficiency. In the end, we explore the maximum effective width of nano-embedding which serves as a reference in designing generators in the efficiency range of interest.
Authors:
;  [1] ;  [2]
  1. Department of Electrical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076 (India)
  2. Department of Physics and Astronomy, Michigan State University, East Lansing, MI-48824 (United States)
Publication Date:
OSTI Identifier:
22492150
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 10; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; DESIGN; ENGINEERING; MATRIX MATERIALS; NANOWIRES; POWER DENSITY; POWER GENERATION; THERMOELECTRIC GENERATORS; THERMOELECTRIC MATERIALS NESDPS Office of Nuclear Energy Space and Defense Power Systems