Iifotodiodes, ezikwabizwa ngokuba zii-photocells, zizixhobo zombane eziguqula ukukhanya kube ngumbane.Zisetyenziselwa uluhlu olubanzi lwezicelo ezibandakanya ukukhanya kokukhanya, ukutshintshwa kwe-optical, kunye nemifanekiso yedijithali.Iifotodiodes ziquka i-semiconductor junction ekhupha ii-electron xa iboniswe ekukhanyeni.Umsinga abawuvelisayo ulingana nobunzulu bokukhanya, kwaye unokusetyenziselwa ukubona ubukho bokukhanya okanye ukulinganisa ubunzulu bako.