The development of piezoelectric cantilever beams for cochlear implants has gained significant momentum in recent times. This study focuses on the implementation of a piezoelectric material, PZT-8, which is coated with Al2O3 and parylene C on both sides. The proposed model incorporates three electrodes made of Ti/Pt material to obtain the output voltage. The dimensions and structure of the cantilever beams were adopted from a previous project, which included four different configurations. A simulation procedure is utilized to evaluate the displacement, output voltage, and Sound Pressure Level (SPL) of each beam. Additionally, the resonance frequency, Q-factor, and Electromechanical Coupling Coefficient (EMCC) are calculated for each beam and compared with previous studies. Moreover, the proposed model's displacement in both water and air environments is simulated, and the resulting output is obtained as deformation due to stress. In comparison to the existing model, the proposed model utilizing PZT-8 material demonstrates superior performance in terms of resonance frequency and Q-factor.