Piezoelectric Material Pulsed Laser Deposition Rate Control

The deposition process is divided into multiple sequential steps with different deposition rates. The first step uses a low deposition rate to establish a template layer with uniform crystal orientation, while subsequent steps use higher deposition rates to complete the film formation. This segmentation allows each step to optimize for its specific function, resolving the contradiction between manufacturing precision and time loss.

A preliminary low-rate deposition step is performed first to create a template layer with properly oriented crystal structure. This preliminary action establishes the foundation that guides subsequent high-rate deposition, ensuring that even when depositing at higher speeds, the crystal structure maintains uniform orientation. This resolves the contradiction by preparing the system in advance to handle faster deposition without sacrificing precision.

The deposition is segmented into a first layer at low rate and subsequent layers at higher rates. The first layer maintains the dense, uniform microstructure that provides good piezoelectric coupling, while the higher-rate subsequent layers create a less constrained structure that allows freer expansion. This segmentation resolves the contradiction by assigning different functional roles to different parts of the film.

The preliminary low-rate deposition creates a template layer with uniform crystal orientation that serves as a foundation. This preliminary structure provides the necessary piezoelectric performance, while the subsequent high-rate deposition layers provide the free shrinkage movement capability. The preliminary action ensures that even with erratic high-rate deposition, the overall structure maintains good orientation from the foundation layer.