中国科学技术大学物理系微电子专业 语 1873: W. Smith discovered light sensitivity of semiconductors 1875: Werner von siemens invented a selenium photometer WERNER VON SIEMENS-1816-189Z 1878: Alexander graham Bell used this device for a wireless communication syst Semiconductor Devices 2021/2/4中国科学技术大学物理系微电子专业 2021/2/4 Semiconductor Devices 9