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Minority carrier lifetime imaging of silicon wafers calibrated by quasi-steady-state photoluminescence
- Source :
- Solar Energy Materials and Solar Cells. 95:1011-1018
- Publication Year :
- 2011
- Publisher :
- Elsevier BV, 2011.
-
Abstract
- Reliable process control or predictions of solar cell efficiencies from minority carrier lifetimes on silicon wafers require precise lifetime measurements. For inhomogeneous material quality this implies the necessity of adequately averaged spatially resolved lifetime measurements. Materials such as, e.g. multicrystalline upgraded metallurgical grade silicon frequently feature relatively low lifetimes, high trap densities, and several material parameters (charge carrier mobilities and net dopant concentration) that are not straightforwardly predictable or measurable. As this may substantially compromise conventional lifetime measurements, we present a solely luminescence based lifetime imaging technique, which requires virtually no a priori information about material parameters. Our approach is based on a calibration of a wafer's photoluminescence image through a precise lifetime determination of a part of this wafer via quasi-steady-state photoluminescence. Carrier mobilities, net dopant concentration, and surface morphology leave the determination of lifetime virtually unaffected, the injection dependence of lifetime is properly taken into account, and lifetimes down to the timescale of a microsecond can be reliably measured.
- Subjects :
- Photoluminescence
Materials science
Silicon
Messtechnik und Produktionskontrolle
Analytical chemistry
chemistry.chemical_element
Siliciummaterialcharakterisierung
law.invention
law
Solar cell
Wafer
Charakterisierung
Solarzellen - Entwicklung und Charakterisierung
Dopant
Renewable Energy, Sustainability and the Environment
business.industry
Carrier lifetime
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Silicium-Photovoltaik
Microsecond
chemistry
Optoelectronics
Charge carrier
Zellen und Module
business
Charakterisierung von Prozess- und Silicium-Materialien
Subjects
Details
- ISSN :
- 09270248
- Volume :
- 95
- Database :
- OpenAIRE
- Journal :
- Solar Energy Materials and Solar Cells
- Accession number :
- edsair.doi.dedup.....a8c1d2e19b407b2c7267c685282cd562