What question did this study set out to answer?

The aim is to explore the formation and thermoelectric properties of Si-Fe composites with embedded α-FeSi2 nanocrystals.

March 6, 20260 citationsOpen Access

Si-Fe composites with embedded α-FeSi2 nanocrystals: formation and thermoelectric properties

NGNikolay GalkinInstitute of Automation and Control Processes KGKonstantin GalkinInstitute of Automation and Control Processes OKOleg KropachevInstitute of Automation and Control Processes

Key Points

The aim is to explore the formation and thermoelectric properties of Si-Fe composites with embedded α-FeSi2 nanocrystals.
Utilized silicon-on-insulator (SOI) substrates for composite growth.
Embedded α-FeSi2 nanocrystals into silicon multilayers with varying hole concentrations.
Measured power factor and sheet resistance at 450 K.
Maximum power factor ranged from 0.1 to 0.25 mW/(m×K2) at T = 450 K.
The highest power factor was observed with maximum hole concentration in silicon interlayers.
Decreased hole concentration correlated with a power factor decrease to 0.01 mW/(m×K2) at T = 450 K.

Abstract

The technology of embedding metallic iron disilicide (α-FeSi2) nanocrystals (NCs) with different numbers of NCs multilayers and different doping levels of silicon multilayers with holes (1019 cm−3 and 1013 cm−3) was tested on SOI substrates, and composites with 4 and 8 layers of embedded α-FeSi2 NCs were grown using it. The maximum power factor 0.1 to 0.25 mW/(m×K2) at T = 450 K was observed in the composite with the maximum hole concentration in the silicon interlayers, and a decrease in the hole concentration led to a decrease in the power factor to 0.01 mW/(m×K2) at T = 450 K due to a sharp decrease in the sheet resistance with a weak increase in the Seebeck coefficient.

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