Dye Sensitized Nanocrystalline Photovoltaic Cell. Group 1 – Luke, Matt, and Jeff. Theory. Schematic of Graetzel Cell. Theory. The adsorbed dye molecule absorbs a photon forming an excited state. [dye*] The excited state of the dye can be thought of as an electron-hole pair (exciton).
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Group 1 – Luke, Matt, and Jeff
Charge must be rapidly separated to prevent back reaction.
Dye sensitized solar cell, the excited dye transfers an electron to the TiO2 and a hole to the electrolyte.
In the PN junction in Si solar cell has a built-in electric field that tears apart the electron-hole pair formed when a photon is absorbed in the junction.