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TitleHigh-performance μ-thermoelectric device based on Bi2Te3/Sb2Te3 p-n junctions
Author(s)Vieira, Eliana Maria Fernandes
Pires, A. L.
Silva, José Pedro Basto
Magalhães, V. H.
Grilo, J.
Brito, F.P.
Silva, M. F.
Pereira, A. M.
Gonçalves, L. M.
Keywordsflexible device, COMSOL software
p-n junctions
telluride alloys
μ-thermoelectric generator
Issue date23-Oct-2019
PublisherAmerican Chemical Society
JournalACS Applied Materials & Interfaces
Abstract(s)A flexible and ultralight planar thermoelectric generator based on 15 thermocouples composed of n-type bismuth telluride (Bi2Te3) and p-type antimony telluride (Sb2Te3) legs (each with 400 nm thick) connected in series, on 25 μm thick Kapton substrate, was fabricated with impressive power factor values of 2.7 and 0.8 mW K-2 m-1 (at 298 K) for Bi2Te3 and Sb2Te3 films, respectively. The p-n junction thermoelectric device can generate a maximum open-circuit voltage and output power of 210 mV and 0.7 μW (3.3 mW cm-2), respectively, for a temperature difference of 35 K, which is higher than the one observed for a conventional thermoelectric device with metallic contacts for p-n junctions. The results were combined with numerical simulations, showing a good match between the experimental and the numerical results. The current density versus voltage (J-V) characteristics of the fabricated p-n junctions revealed a diode behavior with a turn-on voltage of ≈0.3 V and an impressive rectifying ratio (I+1V/I-1V) of ≈2 × 104.
Publisher version
AccessRestricted access (UMinho)
Appears in Collections:CDF - FMNC - Artigos/Papers (with refereeing)

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