Optimization of Chemical and Electrochemical Methods of Metal Deposition on Thermoelectric Materials | IEEE Conference Publication | IEEE Xplore

Optimization of Chemical and Electrochemical Methods of Metal Deposition on Thermoelectric Materials


Abstract:

Methods of obtaining contacts to thermoelectric materials based on Bi2Te2.8Se0.2 and Bi0.5Sb1.5Te3 by chemical and electrochemical deposition of nickel, up to 20 μm thick...Show More

Abstract:

Methods of obtaining contacts to thermoelectric materials based on Bi2Te2.8Se0.2 and Bi0.5Sb1.5Te3 by chemical and electrochemical deposition of nickel, up to 20 μm thick, have been optimized. Using a galvanostatic mode in an electrolyte containing: NiSO4×7H2O; NaCl; H3BO3, the rest is water, at a current density of 1 A/dm2, nickel contacts with an adhesion strength of 8.70 to 10.66 MPa were obtained. The maximum adhesion strength was obtained for contact layers with a thickness of 8 microns formed by chemical deposition of Ni on the legs of thermoelements with a pre-deposited Ni layer 300 nm thick. Chemical deposition of Ni was carried out in a borohydride electrolyte containing: NiSO4×7H2O; KNaC4H4O6×4H2O; NaOH; C2H5NO2; K2Cr2O7; NaBH4 at a temperature of 80-90°C. The adhesion strength of the obtained nickel contacts is 15.87-16.56 MPa. The specific contact resistance for optimized contact formation methods ranges from 1.0 to 2.0*10-9 Ohm*m2.
Date of Conference: 26-29 January 2021
Date Added to IEEE Xplore: 09 April 2021
ISBN Information:

ISSN Information:

Conference Location: St. Petersburg, Moscow, Russia

Funding Agency:


I. Introduction

The creation of alternative methods of energy conversion is one of the most promising areas in science and technology. Devices operating on the Seebeck effect - thermoelectric generators (TEG) are alternative energy sources and are used to directly convert thermal energy into electrical energy. For their operation, a wide variety of heat sources can be used, for example, "waste" heat, which is 60% of the generated energy [1], [2]. The most important task in the manufacture of effective thermoelements (TE) is to ensure high-quality contact with thermoelectric materials (TEM), from which thermoelements are made. Contact systems (CS) in thermoelectric devices perform the following functions: carry out ohmic contact with TEM; prevents interdiffusion of materials; ensure the necessary adhesion of the contact layers to the TEM and to each other and provide switching of legs in a thermoelement and sections in multisection thermoelements.

References

References is not available for this document.