Problem to be solved: to provide a light detecting element having a low dark current.Solution comprises a first electrode and a second electrode, an active layer disposed between the first electrode and the second electrode, and a hole transporting layer provided between the second electrode and the active layer, wherein the active layer comprises an organic compound and the active layer has a thickness of more than The hole transport layer comprises a metal oxide nanoparticle, a photodetector.Diagram【課題】暗電流が低い光検出素子を提供する。【解決手段】第１の電極及び第２の電極と、前記第１の電極及び前記第２の電極の間に設けられた活性層と、前記第２の電極及び前記活性層の間に設けられた正孔輸送層と、を含み、前記活性層は有機化合物を含み、前記活性層の厚さが６００ｎｍ以上であり、前記正孔輸送層は、金属酸化物のナノ粒子を含む、光検出素子。【選択図】図１
