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,...

References

(1) - ZANIO (K.) - Cadmium Telluride: Material Preparation; Physics; Defects and Applications, in Semiconductors and Semimetals - . Vol. 13, Academic Press, 1978.
(2) - CHU (T.L.), CHU (Sh.S.) - University of South Florida, 11th ECPVSEC, Montreux 1992, 988-990....

Theses

- 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,...