Infrared annealing

Allam NK, Grimes CA (2009) Effect of rapid infrared annealing on the photoelectrochemical properties of anodically fabricated Xi02 nanotube arrays. J Phys Chem C 113(19) 7996-7999... 

AH intrinsic germanium metal sold is specified to be N-type with a resistivity of at least 40 H-cm at 25°C or 50 H-cm at 20°C. Germanium metal prepared for use in infrared optics is usuaHy specified to be N-type with a resistivity of 4-40 Hem, to be stress-free and fine annealed, and to have certain minimum transmission (or maximum absorption) characteristics in the 3—5 or 8—12 pm wavelength ranges. Either polycrystaHine or single-crystal material is specified. 

Fig. 18. Infrared spectrum of a s-PS sample in the y form (heavy line) compared to the spectrum of the same sample, after transformation into the a form, by annealing at 200 °C (,light line) [110]...

Coatings for photothermal solar converters with high infrared reflectance, which use Reaction (3) and a 1000°C anneal,... 

The solution-processed doped silicon films described above (baked at 500 °C for 2 hr) exhibited high electrical resistivity (greater than 300 Qcm), which is the measurement limit of the instrument we used. To lower the resistivity, we tried an additional rapid thermal annealing (RTA) of the film prepared from the copolymerized solution with 1 wt% phosphorus concentration. In this RTA, the SiC plate on which the sample was placed was irradiated with infrared (IR) light from a 1-kW IR lamp. The RTA conditions were 600 °C for 2 hr, 650 °C for 20 min, 700 °C for 5 min, and 750 °C for 5 min these temperatures were that of the SiC plate, and the temperature of the Si film is estimated to be several dozens of degrees lower than that. 

For use in infrared optics, zone-refined germanium is recast or grown into forms suitable for lens and window manufacture. Polycrystalline castings of up to 115 kg and single crystals of up to 90 kg are routinely made. After the germanium is annealed, it is cut and ground into lens- or window-blanks, which are then polished, coated, and assembled into an ir system (see Infrared and raman spectroscopy, infrared technology). 

Lasers generate a high-intensity output of monochromatic photon energy, and studies of the photochemical reactions induced by this have created a virtual subdivision of photochemistry known as laser chemistry While the output of a laser can heat, anneal, burn, cut. or be usedinstrumentally as a spectral source, we are concerned here only with those chemical effects attributable to the photon output at wavelengths between near infrared and near ultraviolet, i.e.. between about 12 and 0.2 microns. 

---