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3. Amorphous and microcrystalline silicon sectors
Amorphous materials, unlike crystals, do not have a regular atomic organization, at least over long distances. In fact, a local order is preserved. In amorphous silicon, the chemical bonds between a Si atom and its nearest neighbors satisfy the tetrahedral configuration characteristic of sp 3 hybridization, where each atom is linked to its four neighbors (0.23 nm apart) by a covalent Si-Si bond. In covalent compounds and amorphous chalcogenides, interatomic bond lengths and bond angles vary slightly around average crystal values. This dispersion increases with distance, so that as soon as the distance to a given atom exceeds four to five interatomic distances, the positions are randomly distributed and a significant fraction of covalent bonds are cut, so electrons are unpaired. Such atoms are said to have a dangling bond. This dangling bond...
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Amorphous and microcrystalline silicon sectors
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CdTe
A number of process-related issues remain to be resolved.
CdTe doping is still not well controlled. Empirically, we've found that treatment with CdCl 2 (a compound well known for helping the recrystallization of CdS layers) is beneficial. All at once, it activates the junction, passive grains,...
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- - http://www.sudoc.abes.fr
- POISSANT (Y.) - Étude et optimisation de cellules solaires photovoltaïques en couches minces de silicium polymorphe - . Thèse de doctorat : Physique. Sciences des matériaux. Rhéologie,...
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