Low temperature bonding of piezoelectric single crystal materials for miniaturized high resolution ultrasound transducers

The realization of the next-generation miniaturized ultrasound transducers comprising of fine pitch array elements requires packaging techniques used in the microelectronics industry. In addition, new types of piezoelectric materials are used to enhance the acoustic performance of these transducers, but these materials cannot withstand the temperature and pressure applied in conventional bonding technologies. This paper explored two different bonding techniques specifically to address this issue.