title: The effects of relative humidity and reducing gases on the temperature coefficient of resonant frequency of ZnO-based film bulk acoustic wave resonator.
abstract: This study describes the influence of relative humidity (RH) and reducing gases on the temperature coefficient of resonant frequency (TCF) of ZnO-based film bulk acoustic wave resonator (FBAR). Upon exposure to moisture or reducing gases, the TCF of FBAR decreased. Water molecules can replace adsorbed oxygen on the ZnO surface. This process was less effective at high temperature, resulting in a lower TCF in high RH. Reducing gases, such as acetone, can reduce the density of ZnO through reaction with the adsorbed oxygen, leading to a lower TCF.
authors.forename: Xiaotun
authors.initials: X
authors.lastname: Qiu
authors.forename: Ziyu
authors.initials: Z
authors.lastname: Wang
authors.forename: Jie
authors.initials: J
authors.lastname: Zhu
authors.forename: Jon
authors.initials: J
authors.lastname: Oiler
authors.forename: Rui
authors.initials: R
authors.lastname: Tang
authors.forename: Cunjiang
authors.initials: C
authors.lastname: Yu
authors.forename: Hongyu
authors.initials: H
authors.lastname: Yu