Photoelectrochemical process  From Wikipedia, the free
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navigation, search Photons emitted in a coherent beam from a
laser  Photoelectrochemical processes are processes in
photoelectrochemistry; they usually involve transforming light
into other forms of energy.[1] These processes apply to
photochemistry, optically pumped lasers, sensitized solar cells,
luminescence, and photochromism.  Electron excitation[edit]
Electron excitation is the movement of an electron to a higher
energy state. This can either be done by photoexcitation (PE),
where the original electron absorbs the photon and gains all the
photon's energy or by electrical excitation (EE), where the
original electron absorbs the energy of another, energetic
electron. Within a semiconductor crystal lattice, thermal
excitation is a process where lattice vibrations provide enough
energy to move electrons to a higher energy band. When an
excited electron falls back to a lower energy state ag