Inside the PbS QDs/Bi2O2Se hybrid photodetector, when PbS quantum dots, performing as Strength donors, are photoexcited to an fired up condition, they can transfer their energy non-radiatively to Bi2O2Se by way of dipole–dipole interactions. This will cause electrons inside the valence band of Bi2O2Se to transition on the conduction band. https://www.facebook.com/wiijing.net