To reduce manufacturing costs and to improve electrical efficiency of solar cells are top priorities of the whole
photovoltaic (PV) industry. The success of laser processing techniques in the integrated circuits industry indicates that
such techniques could also be adapted in the PV industry. In this paper, we presented recent progress in advanced laser
processing for manufacturing of high efficiency silicon solar cells at RX Technologies, especially the application of
picosecond laser pulses for ablation and doping on crystalline silicon solar cells. A system based on this technique has
been employed in production line by one of the leading manufacturers of solar cells. Efficiencies of 19.2% and 17.5% for
monocrystalline silicon and polycrystalline silicon have been achieved under the condition of volume production. This
result shows a great improvement, compared with results obtained from traditional manufacturing techniques.
In this paper, we report experimental results of measuring picosecond laser pulses using a second-harmonic generation
(SHG) intensity autocorrelator. This home-made apparatus of the intensity autocorrelation is an attempt to measure the
SHG pulse's intensity change with time. It is clear that an intensity autocorrelation can be used for measuring the pulse
length of the ultrashort pulses laser. Using this SHG intensity autocorrelator, we measured the pulse length of a diodepumped
picosecond passively mode-locked Yb:SSO laser which emits at a central wavelength of 1061nm at a repetition
rate of 52MHz, and a mode-locked picosecond laser amplified system centered on 1064nm at a pulse repetition
frequency of 1K HZ. Compared with the commercial autocorrelator, this setup has a larger measurement range, higher
accuracy, and more reliable results. In addition, using a high resolution spectrum instrument the apparatus becomes a
FROG. The full information of the pulse can be retrieved by using a frequency-resolved optical grating (FROG)
algorithm. This setup should be very useful for further optimization of the diode pumped picosecond laser.
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