ENGRI111_11_photonics2 - ENGRI 111 Photonics - II Direct...

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ENGRI 111 ENGRI 111 Photonics - II
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Direct and Indirect Band Gap Direct and Indirect Band Gap VB CB Direct Band-Gap Indirect Band-Gap VB CB
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Why not Si? Why not Si? Radiative recombination is slow because Si has an  “indirect” band gap The momentum of the recombined electron-hole pair is  different from the excited pair Electrons and holes have to wait for a suitable vibration  to pass by before they can recombine radiatively  This requirement is relaxed in disordered forms of Si
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Nanocrystalline Porous Silicon Nanocrystalline Porous Silicon Sailor Group - UCSD
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Size/Properties Size/Properties
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Molecular Orbital: H Molecular Orbital: H 2 2 www.science.uwaterloo.ca/~cchieh/cact/c120/mo.html
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Molecular Orbital: H Molecular Orbital: H 2 2 www.science.uwaterloo.ca/~cchieh/cact/c120/mo.html
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Crystal Structure Crystal Structure Diamond C, Si, Ge GaAs Zinc blende
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Molecular Orbitals for CH 4 4 sp 3 hybridized orbitals
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ENGRI111_11_photonics2 - ENGRI 111 Photonics - II Direct...

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