For the optical anti-reflection coating (ARC) and passivation properties, the relationship between parameters of PECVD and solar cell photoelectricity properties is investigated in this work. Solar cell’s photoelectricity properties are studied by using various optoelectronic measurement systems. It is found that minority carrier recombination can be reduced by changing the parameters of PECVD, specially tuning pressure parameter, and the hydrogen content is different as the gas total flow changing if the temperature and pressure no changes. And also the hydrogen content can be calculated by absorption spectrum being tested with optoelectronic measurement system.
In this paper, we process images of different patterns with a Fast Fourier Transformation (FFT) to investigate
the spatial development of patterns in dielectric barrier discharge system. A bifurcation scenario from hexagonal
pattern to square pattern is observed under circular boundary as the driving voltage increasing. The spatial
characteristics of hexagonal pattern and square pattern are studied by analyzing their related spatial Fourier spectra.
In addition, a transition from hexagons to squares and a further development of square pattern with dislocation
defect are also researched by analyzing their Fourier spectra.
The influence of different water temperatures on temporal behavior of dielectric barrier discharge in argon at
atmospheric pressure is studied by using an experimental device with water electrodes. It is found that, as the applied
voltage increasing, the evolvement of discharge with different water temperatures shows similar behavior spatially if
argon concentrations are same. The corresponding Fourier transformation is obtained by processing patterns images
with computer program based on the Matlab software. The discharge duration of the first current pulse in half cycle of
different voltage polarity is same in discharge if the two electrodes temperatures are same. But it becomes different if
the two electrodes have different temperatures. The discharge moment is always ahead when the low temperature
electrode is an instantaneous cathode. The analysis shows that the water temperature affects the accumulation of wall
charges, resulting in the differences of temporal behavior of discharge.
The variations of the intensity of argon (2P→1S) spectral lines with various gas mixing ratios in dielectric barrier discharge (DBD) in air/Ar and N<sub>2</sub>/Ar admixtures are studied. The relative intensity of Ar I <i>I</i><sub>750.39nm</sub>/<i>I</i><sub>763.51nm </sub>as a function of experiment conditions (pressure, applied voltage and frequency) in Ar discharge is also measured. In air/Ar and N<sub>2</sub>/Ar admixtures, it is observed that the higher levels of N<sub>2</sub> molecules have quenching selectivity for Ar (2P→1S) spectral lines, and the relative intensity of Ar I <i>I</i><sub>750.39nm</sub>/<i>I</i><sub>763.51nm </sub>increases with increasing air or N<sub>2</sub> concentration in two admixtures, respectively. Both Ar (2P→1S)spectral lines and the relative intensity of Ar I <sub>I750.39nm</sub>/<i>I</i><sub>763.51nm </sub>in N<sub>2</sub>/Ar admixture are higher than that in air/Ar admixture under the same air and N<sub>2</sub> concentration in two admixtures. The relative intensity of Ar I <i>I</i><sub>750.39nm</sub>/<i>I</i><sub>763.51nm </sub>increases from 0.81 to 1.73 when the concentration of air changes from 10% to 73%, but the relative intensity changes from 1.03 to 3.51 when the concentration of N<sub>2</sub> increases from 10% to 73% in N<sub>2</sub>/Ar admixture at a applied voltage of 10kV, a frequency of 26kHz and an atmosphere pressure. Moreover, in Ar discharge, the results demonstrate that the pressure has great effect on the relative intensity of Ar I <i>I</i><sub>750.39nm</sub>/<i>I</i><sub>763.51nm</sub>, which decreases with increasing the pressure. But it changes slightly with the applied voltage and the frequency.