Electroless plating apparatus and method

An electroless plating apparatus, used for plating at least one wafer, comprising:

• a container, used for containing electrolyte and provided with at least an inlet;
• a wafer holder, vertically movably provided within the container, used for holding at least one wafer, so as to fully immerse the at least one wafer vertically in the electrolyte, and the wafer holder comprises a hollow frame and at least one pair of clamps being disposed at the two sides of the hollow frame for holding at least one wafer;
• a shaking unit, connected with the wafer holder for shaking the wafer holder vertically, wherein the shaking unit comprises a driving device, a linking element, and a first connecting element;
• the driving device is connected with the linking element for moving the linking element vertically;
• and one side of the first connecting element is connected with the linking element while another side thereof is connected to an upper part of the frame of the wafer holder;
• an electrolyte supplying unit for supplying the electrolyte into the container via the inlet;
• and
• an ultrasonic-vibration unit, consisting of at least one frequency ultrasonic transducer being disposed in the container and used for producing a uniform flow of electrolyte in the container.