Determination of the temperature coefficient piezoelectric constant TCe33 to improve thermal 1D acoustic tool for BAW resonator design

This paper presents a full characterization of the thermal parameters to improve the thermal Mason´s model for BAW resonator design, in particular, the temperature dependence of the velocity TC(V), the elasticity TC(C₃₃ ^D), the piezoelectric coefficient TC(e₃₃) and the permittivity TC(¿₃₃) for the AlN film. These parameters associated with the piezoelectric theory assesses the TC(e₃₃) coefficient. To do so, the temperature piezoresponse force microscopy (PFM) technique is used to measure the temperature dependence of the (d_33eff) coefficient. The thermal RF measurement is used to characterize the TC(¿₃₃) and the ultrasonic picosecond tool with its heating system is used to characterize the TC(C₃₃ ^D). Finally, the thermal Mason´s model is compared with the experimental response of the BAW resonator.