Journal Article

FZJ-2021-05142

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Thermoelectric Efficiency of Epitaxial GeSn Alloys for Integrated Si-Based Applications: Assessing the Lattice Thermal Conductivity by Raman Thermometry

Spirito, D. (Corresponding author) ; von den Driesch, N. (Corresponding author)FZJ* ; Manganelli, C. L. ; Zoellner, M. H. ; Corley-Wiciak, A. A.FZJ* ; Ikonic, Z. ; Stoica, T. ; Grützmacher, D.FZJ* ; Buca, D. M. (Corresponding author)FZJ* ; Capellini, G.

2021
ACS Publications Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/31664  doi:10.1021/acsaem.1c01576

Abstract: Energy harvesting for Internet of Things applications,comprising sensing, life sciences, wearables, and communications, requiresefficient thermoelectric (TE) materials, ideally semiconductors compatiblewith Si technology. In this work, we investigate the potential of GeSn/Gelayers, a group IV material system, as TE material for low-grade heatconversion. We extract the lattice thermal conductivity, by developing ananalytical model based on Raman thermometry and heat transport model,and use it to predict thermoelectric performances. The lattice thermalconductivity decreases from 56 W/(m·K) for Ge to 4 W/(m·K) byincreasing the Sn atomic composition to 14%. The bulk cubic Ge0.86Sn0.14alloy features a TE figure of merit of ZT ∼ 0.4 at 300 K and an impressive1.04 at 600 K. These values are extremely promising in view of the use ofGeSn/Ge layers operating in the typical on-chip temperature range.

Keyword(s): Energy (1st) ; Materials Science (2nd)

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA-FIT (JARA-FIT)

Research Program(s):

1. 5234 - Emerging NC Architectures (POF4-523) (POF4-523)

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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