A camera for recording the intensity of light backscattered from textured photovoltaic (PV) samples is described. It was realized by modifying a professional folding camera, for use on an optical bench. The collimated light from a laser source crosses the camera and impinges on the test sample. The light backscattered by the sample exposes a punched photographic plate placed on the front side of the camera. With a proper choice of laser light intensity and wavelength, the optical diffusing effects produced by surface morphology or by subsurface features of the sample can be recorded in this way. The analysis of light diffusing characteristics of textured PV samples, mainly based on crystalline silicon material, can be directed towards improving their light collection capabilities. The camera can be assembled in such a way as to record the light diffusion images produced in reflection by both small and large samples, or those produced in transmission from textured semitransparent materials.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics