Photo-injection (or photoinjection) primarily refers to a fundamental process in solid-state physics and semiconductor chemistry where light energy is used to excite and introduce extra charge carriers (electrons or holes) into a material. This concept is critical to the development of modern optoelectronics, ultrafast computer processors, and solar energy technologies. How Photo-Injection Works
At its core, photo-injection behaves like a localized, internal version of the photoelectric effect.
Light Absorption: A material (such as a semiconductor, dye molecule, or metal nanostructure) absorbs incoming photons.
Carrier Generation: If the photon energy is high enough, it kicks an electron out of its bound state (the valence band) into an excited, mobile state (the conduction band).
Injection: These excited “hot carriers” cross over an interfacial boundary into an adjacent material layer—such as from a light-absorbing dye into a titanium dioxide ( TiO2cap T i cap O sub 2 ) substrate. Key Scientific Applications
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