Bandgap determination based on electrical quantum efficiency
| Autor: | C. Karcher, Henning Helmers, Andreas W. Bett |
|---|---|
| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) business.industry Band gap Semiconductor materials chemistry.chemical_element temperature Germanium Alternative Photovoltaik-Technologien Atmospheric temperature range Electroluminescence Solarzellen und Bauelemente Materialien - Solarzellen und Technologie Exponential function bandgap electroluminescence chemistry efficiency Attenuation coefficient III-V und Konzentrator-Photovoltaik Optoelectronics Quantum efficiency III-V Epitaxie und Solarzellen business |
| Popis: | A procedure to determine the bandgap of a semiconductor material from spectral electrical quantum efficiency measurements is presented. The procedure is based on the disorder-related exponential band tailing at energies below the bandgap, i.e., exponential onset of the absorption coefficient (often referred to as Urbach's rule). The procedure is applied to three materials, namely, Ga0.50In0.50P, Ga0.99In0.01As, and Ge, and the temperature-dependent bandgaps are derived for a temperature range of 278 to 443 K. The results are compared and validated with data from the literature and electroluminescence measurements. |
| Databáze: | OpenAIRE |
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