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Influence of the average Se-to-metal overpressure during co-evaporation of Cu(InxGa1−x)Se2
- Source :
- Thin Solid Films. 519:7237-7240
- Publication Year :
- 2011
- Publisher :
- Elsevier BV, 2011.
-
Abstract
- The influence of the average Se-to-metal overpressure during three-stage co-evaporation of Cu(InxGa1−x)Se2 solar absorber layers has been investigated. Solar cell devices were fabricated using a baseline process consisting of chemical bath deposited CdS, magnetron sputtered intrinsic and Al-doped ZnO, and e-beam evaporated Ni/Al/Ni current collection grid. For the higher Se-to-metal rate ratios studied, an increased short-circuit current in combination with a decreased fill factor is observed, while the open-circuit voltage stays fairly constant. Based on quantum efficiency measurements, fitting of IV data to a one-diode model, and simulations, we suggest the observed effects to be due to a decreased effective doping in combination with a decreased bulk recombination with higher average Se-to-metal overpressures. This could e.g. be explained by a decreasing number of Se-vacancies or VSe–VCu divacancies with higher Se rate. For the range of lower average Se-to-metal rate ratios studied, device performance drops due to a decreased open-circuit voltage and, for the lowest Se rate investigated, fill factor. In addition to electrical characterization, the effects on absorber microstructure are discussed based on results obtained from X-ray diffraction and scanning electron microscopy.
- Subjects :
- Materials science
Scanning electron microscope
Doping
Metals and Alloys
Evaporation
Analytical chemistry
Surfaces and Interfaces
Microstructure
Copper indium gallium selenide solar cells
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
law.invention
law
Solar cell
Cavity magnetron
Materials Chemistry
Quantum efficiency
Subjects
Details
- ISSN :
- 00406090
- Volume :
- 519
- Database :
- OpenAIRE
- Journal :
- Thin Solid Films
- Accession number :
- edsair.doi...........c7e80e1d6da1fef9fceec1246f6e09ec