Since the discovery of semiconductor thermoelements, there has been much effort to enhance the e2- ciency of thermoelectric (TE) devices. Along with efforts to increase a material’s œgure of merit, the use of functionally graded materials (FGM) offers other ways to further improve device performance [1-40]. Graded TEs are characterized by a macroscopic gradient in their functional properties, caused by spatial variation of the composition (including doping) or microstructure. Also noncontinuously graded (i.e., segmented) elements are considered FGM since they lead to the same functional effect.
ASJC Scopus subject areas
- Environmental Science(all)