Crystalline Si solar cells fabricated by CO2 laser doping
We proposed CO<sub>2</sub> laser doping technique as a fabrication method of c-Si solar cell, and demonstrated its availabilities with the cell characteristics. P and B-doping with relatively high carrier density around 10<sup>20</sup> cm<sup>-3</sup> were realized by the CO<sub>2</sub> laser irradiation. We found that the pulse frequency is one of the most important parameter to improve the cell performances.
22.0% Efficient Laser Doped back Contact Solar Cells
Abstract We present the first laser doped interdigitated back contacted solar cells with efficiency η = 22.0%. The cell area is 2 x 2 cm 2 , and contains the metallization of both busbars. The high flexibility and spatial resolution of our laser doping process enables local n-type and p-type doping with a precision below 30 μm and avoids any masking process.
Multiple-beam antennas: Offset reflectors with offset feeds
Two simple mathematical models are described for the prediction of the vector radiation fields from offset parabolic reflector antennas with offset feeds. Experimental support for the predictions obtained from the models has been obtained by comparisons with measured data from antenna systems operating at 30 GHz. The principal radiation characteristics of the offset-reflector with offset-feed configuration are discussed.