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Accuflect® Solar Cell Furnace Reflectors
Accuflect®
IR is an excellent medium wave and short wave infrared reflector with excellent
performance extending into the visible wavelengths.
Many infrared applications can be modified to take advantage of the highly
efficient diffuse reflection characteristics of Accuflect® IR.
Applications can be found throughout solar cell manufacturing in both
crystalline and thin film segments of the business. Some of the applications
include:
- Preheating of solar cells prior to sputtering or diffusion
- Drying
- Firing of metallized layers
- Deposition of antireflection coatings
- Rapid thermal annealing of thin films
- Cell to cell bonding
The infrared systems use short wave emitters with emission wavelengths on the
order of 1 to 2 microns. This allows for very high watt densities. The peak
emission wavelength can also be "tuned" to more closely match the absorption
spectrum of the solar cell materials. Advantages of using Accuflect®
IR in the solar cell fabrication processes relying on infrared radiation
include:
- More uniform IR radiation in the heat process zone
- Solar materials "see" a planar emission source rather than a line or point
source reducing process variability due to distance from the emitter
- Refractoriness eliminates the need for active cooling of the reflector
surfaces
- Low thermal impedance allows tight process control loops
- Cleanliness in high temperature process zones
- Recuperative effect of reflection back onto the emitters reduces electrical
power input
- Radiation from the warm reflector surfaces helps heat the solar materials
improving process efficiency
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