STAEBLER WRONSKI EFFECT IN HYDROGENATED AMORPHOUS SILICON AND RELATED ALLOY FILMS

Nanocrystalline silicon suffers less from the Staebler—Wronski effect than amorphous silicon, suggesting that the disorder in the amorphous silicon Si network plays a major role. By using this site, you agree to the Terms of Use and Privacy Policy. The Staebler—Wronski Effect SWE refers to light-induced metastable changes in the properties of hydrogenated amorphous silicon. Retrieved from ” https: Light Induced Effects in a-Si: However, new experimental evidence is casting doubt on this model. The Physics of Solar Cells.

Views Read Edit View history. A neighbouring H atom then forms a new bond with one of the Si atoms, leaving a dangling bond. However, new experimental evidence is casting doubt on this model. The Staebler—Wronski Effect SWE refers to light-induced metastable changes in the properties of hydrogenated amorphous silicon. Other properties that could play a role are hydrogen concentration and its complex bonding mechanism, as well as the concentration of impurities. Branz, The hydrogen collision model: It was discovered by David L.

Staebler and Christopher R.

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These dangling bonds can trap electron-hole pairs, thus reducing the current that can pass through. This light induced degradation is the major disadvantage of amorphous silicon as a photovoltaic material. Branz, The hydrogen collision model: Retrieved from ” https: By using this site, you agree to effet Terms of Use and Privacy Policy.

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Nanocrystalline silicon suffers less from the Staebler—Wronski effect than amorphous silicon, suggesting that the disorder in the amorphous silicon Si network plays a major role. Retrieved 31 October The Staebler—Wronski Effect SWE refers to light-induced metastable changes in the properties of hydrogenated amorphous silicon. Other properties that could play a role are hydrogen concentration and its complex bonding mechanism, as well as the concentration of impurities.

Historically, the most favored model reated been the hydrogen bond switching model.

The efficiency of an amorphous silicon solar cell typically drops during the first six months of operation. H Films and Solar Cells, Mat.

Staebler–Wronski effect – Wikipedia

It was discovered by David L. B, 59 The equilibrium level shifts with operating temperature so that performance of modules tend to recover some in the summer months and drop again in the winter months. Light Induced Effects in a-Si: Webarchive template wayback links Use dmy dates from December This page was last edited on 6 Octoberat The defect density of hydrogenated amorphous silicon a-Si: Quantitative description of metastability in amorphous silicon, Phys.

The Physics of Solar Cells.

Staebler-Wronski Effect in Hydrogenated Amorphous Silicon and Related Alloy Film

A neighbouring H atom then forms a new bond with one of the Si atoms, leaving a dangling bond. After this initial drop, the effect reaches an equilibrium and causes little further degradation. They showed that the dark current and photoconductivity of hydrogenated amorphous silicon can be reduced iflms by prolonged illumination with intense light.

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H increases with light exposure, causing an increase in the recombination current and reducing the efficiency of the conversion of sunlight into electricity. Most of this loss comes in the fill factor of the cell. Views Read Edit View history. From Wikipedia, the free encyclopedia.

More recently, the H collision model proposed that two spatially separated recombination events cause emission of mobile hydrogen from Si—H bonds to form two dangling amogphous, with a metastable paired H state binding the hydrogen atoms at a distant site. The exact nature and cause of the Staebler—Wronski effect is still not well known.

However, new experimental evidence is casting doubt on this model.