Transport Properties of 40% La Filled Skutterudite Thin Films - Theory and Instrumentation
Abstract (Summary)This study researches thin films fabricated by pulsed-laser ablation on tempered glass substrates using 40% La filled-Skutterudite. In general, laser ablated films exhibit up to 70% amorphous structure and vary in thickness by about 20% from center to edge. The thermoelectric figure of merit determined using a modified version of the Harman equation at room temperature approaches a value of 18. The modifications include the effects of the substrate and its thickness. An empirical figure of merit obtained using the voltage measurements under adiabatic and isothermal conditions was extrapolated to zero substrate thickness. A total of 16 samples were prepared in three ablation runs with different substrate thickness and with an average film thickness of 95 nm. The higher figure of merit obtained compared to bulk samples can be the result of a variety of possibilities: enhanced Seebeck coefficient and size limited thermal conductivity in both electronic and lattice components due to limited mean free path.
School Location:USA - Ohio
Source Type:Master's Thesis
Keywords:thermoelectric figure of merit skutterudite
Date of Publication:01/01/2008