Development of high, stable-efficiency triple-junction a-Si alloy solar cells. Final technical report

Deng, Xiaoyu; Jones, S.J.; Liu, T.; Izu, M.

doi:10.2172/595611

Cited by 2 publications

(2 citation statements)

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“…When a-Si is deposited at a lower temperature with higher H dilution, more H is incorporated and the material has a wider band gap. By following the edge of the transition curve (but staying on the amorphous side) while reducing the deposition temperature, wide-gap a-Si and single-junction a-Si n-i-p cells with 1.053 V open-circuit voltage were deposited [76,118]. It was also observed that materials deposited near the edge of microcrystalline formation show intermediate-range structural order [119].…”

Section: Hydrogen Dilutionmentioning

confidence: 99%

Amorphous Silicon‐Based Solar Cells

Schiff

Hegedus

Deng

2010

Handbook of Photovoltaic Science and Engineering

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Crystalline semiconductors are very well known, including silicon (the basis of the integrated circuits used in modern electronics), Ge (the material of the first transistor), GaAs and the other III-V compounds (the basis for many light emitters), and CdS (often used as a light sensor). In crystals, the atoms are arranged in near-perfect, regular arrays or lattices. Of course, the lattice must be consistent with the underlying chemical bonding properties of the atoms. For example, a silicon atom forms four covalent bonds to neighboring atoms arranged symmetrically about it. This "tetrahedral" configuration is perfectly maintained in the "diamond" lattice of crystal silicon. There are also many noncrystalline semiconductors. In these materials the chemical bonding of atoms is nearly unchanged from that of crystals. Nonetheless, a fairly small, disorderly variation in the angles between bonds eliminates the regular lattice structure. Such noncrystalline semiconductors can have fairly good electronic properties-sufficient for many applications. The first commercially important example was xerography [1, 2], which exploited the photoconductivity of noncrystalline selenium. As do all semiconductors , selenium absorbs those photons from an incident light beam that have photon energies exceeding some threshold energy. The photon that is absorbed generates a positively charged "hole" and a negatively charged electron that are separated and swept away by the large electric fields used in xerography. However, solar cells require that photogenerated electrons and holes be separated by relatively modest electric fields that are "built-in" to the device, and selenium and many other noncrystalline semiconductors proved unsuitable for making efficient cells.

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Section: Hydrogen Dilutionmentioning

confidence: 99%