Methods of forming a roughened surface through diffusion-enhanced crystallization of an amorphous material are disclosed. The method includes receiving at the pin a power input signal from the system, generating a power control signal based on the power input signal through a control signal generating circuit, and sending the power control signal to the integrated circuit. Since the flow-field plate according to the present invention may comprise flow grooves extending radially and having short flow path, which is benefit for reactants diffusion, there is no \u201cdead-end\u201d on the flow-field plate and reactants may distribute uniformly to each part of flow-field plate.