ʻO Photodiodes, i ʻike ʻia he photocells, he mau mea ʻike uila e hoʻohuli i ka mālamalama i ke au uila.Hoʻohana ʻia lākou no kahi ākea o nā noi me ka ʻike kukui, nā hoʻololi optical, a me ke kiʻi kiʻi kiʻi.Aia nā Photodiodes i kahi hui semiconductor e hoʻokuʻu i nā electrons ke ʻike ʻia i ka mālamalama.ʻO ke ʻano o kēia manawa a lākou e hana ai, ua like ia me ka ikaika o ka mālamalama, a hiki ke hoʻohana ʻia e ʻike i ke alo o ka mālamalama a i ʻole ke ana ʻana i kona ikaika.