Patent attributes
A method of cleaning a substrate without causing damage to the substrate is provided. The method comprises the steps of providing a transmitter made of a material that is a good conductor of megasonic energy, positioning the transmitter so that a lower edge is positioned spaced from but closely adjacent to a substantially flat surface of the substrate so that when liquid is applied to the edge and the substrate, a meniscus of liquid is formed between the edge and the substrate, providing a transducer for producing megasonic vibration, coupling the transducer to the transmitter so that a transmission path is created to transmit the megasonic vibration into the transmitter, and creating a barrier in the transmission path so that the liquid vibration is attenuated directly beneath the lower edge of the transmitter.
