Two image processing tools to analyse alkaline texture and contact finger geometry in microscope images

For texture quality assessment, a detailed microscopic analysis acts as a valuable addition to reflection measurements. The pyramidal surface structure of alkaline texture is suitable to be characterized by geometric parameters. After metallization, microscopic measurements also contribute to the assessment of printing results. The latter depend on the surface of the solar cell and are thus interconnected with texture surface properties. In the following, two tools are presented which allow a combined quantification of texture and contact finger geometry. Relevant parameters are identified for this purpose and the conformity of these parameters with manual evaluations and established measurement methods is demonstrated. Pyramids are detected with high precision for diverse textures (97±2%) and the contact finger parameters agree with reference methods (relative deviation of ±2%). The combined analysis is found suitable to investigate the relation between texture and contact finger parameters.