| http://www.w3.org/ns/prov#value | - A circuit board according to the present invention is a circuit board, including: a substrate, and a phase change layer on the substrate, the phase change layer including a phase change material that includes a chalcogenide semiconductor and changes between an electrically insulating state in an amorphous phase and an electrically conductive state in a crystalline phase by irradiation of laser lig
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