Sanjay Sampath¹, Felipe Caliari¹; ¹Stony Brook University

Widespread thermoelectric energy harvesting application requires not only high performance materials but also cost effective/scalable processing of devices. Secondly, integration of the devices into thermal system is also a consideration for efficient conversion of waste heat.In this study, we show the capability of plasma spray materials processing technology to not only synthesize oxide based thermoelectric materials through novel processing concepts, but also demonstrate patterned and multilayer assemblies of devices with consideration of their integration into wasteheat energy systems. The p-n junction type devices were synthesized using plasma spraying of TiO2-x suboxides (n-type) and Ca2Co2O5. In the case of TiO2-x, the plasma environment can be controlled to produce deposits with ZT of 0.13 at 500C while the Ca2Co2O5 showed a ZT of 0.27 at 550C. By strategically combining the two oxides in series and parallel thermoelectric devices were fabricated and tested.