Photodiode, izwi kandi nka Photocells, ni ibikoresho bya elegitoronike bihindura urumuri mumashanyarazi.Byakoreshejwe muburyo butandukanye bwa porogaramu zirimo kumva urumuri, guhinduranya optique, no kwerekana amashusho.Photodiode igizwe na semiconductor ihuza isohora electron iyo ihuye numucyo.Umuyoboro utanga uringaniye nuburemere bwurumuri, kandi urashobora gukoreshwa kugirango umenye urumuri cyangwa gupima ubukana bwarwo.