INVESTIGATION OF LASER SPECKLE PATTERNS OF SOLAR CELLS

Using an abrasive paper, the surface of commercial solar cells has been diffused with different micrometer features. Laser speckle patterns obtained from the different rough surface of solar cells were recorded using laser speckle photography technique. Different laser sources were used with a variable inclination with the solar cell optical axis. For each inclination angle, the contrast of the recorded speckle pattern was calculated. This speckle contrast gives a good indication about the solar cell roughness studied in this work. Furthermore, the speckle contrast changes significantly with the changing of the beam angle of incidence and its wavelength.