During the PbS QDs/Bi2O2Se hybrid photodetector, when PbS quantum dots, acting as Power donors, are photoexcited to an excited point out, they could transfer their Power non-radiatively to Bi2O2Se through dipole–dipole interactions. This will cause electrons while in the valence band of Bi2O2Se to transition to your conduction band. From https://waiijing76320.bloggazza.com/27757982/the-definitive-guide-to-waiijing