ENGRI_1110_Lect14_08

ENGRI_1110_Lect14_08 - Shockley-Queisser analysis (1961) It...

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Unformatted text preview: Shockley-Queisser analysis (1961) It is based on four assumptions: 1- single p-n junction 2- one electron-hole pair excited for incoming photon 3- thermal relaxation of the electron-hole pair energy in excess of the bandgap 4- illumination with unconcentrated sunlight Maximum efficiency of 31% is obtained for a band gap of about 1 eV Challenges Challenges Silicon cannot absorb all photons Other losses come from Fast recombination Thermalization • Energy more than Eg lost as heat Indirect band gap semiconductor Challenges Challenges Silicon cannot absorb all photons Other losses come from Fast recombination Thermalization • Energy more than Eg lost as heat Indirect band gap semiconductor Every photon does not produce an e/h pair Materials for photovoltaic cells Materials for photovoltaic cells Bulk semiconductors Silicon • Single crystal • Multi crystalline Gallium arsemide (GaAs) Other III-V semiconductors Thin Films semiconductors Amorphous silicon (a-Si) Cadmium telluride (CdTe) Copper-Indium diselenide (CuInSe2, o CIS) Coper-Gallium-Indium diselenide (CIGS) Organic and hybrid materials- Small molecules- Polymers- Dye Sensitized Solar Cell CdTe Hydrogenated Amorphous...
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This note was uploaded on 10/01/2008 for the course ENGRI 1110 taught by Professor Giannelis during the Fall '07 term at Cornell.

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ENGRI_1110_Lect14_08 - Shockley-Queisser analysis (1961) It...

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