Inside the PbS QDs/Bi2O2Se hybrid photodetector, when PbS quantum dots, acting as Electrical power donors, are photoexcited to an enthusiastic state, they can transfer their Electrical power non-radiatively to Bi2O2Se by way of dipole–dipole interactions. This triggers electrons in the valence band of Bi2O2Se to transition for the conduction band. https://companyspage.com/story2859748/%E0%B9%84%E0%B8%A7%E0%B8%88%E0%B8%A3-%E0%B8%87-no-further-a-mystery