Process optimization in solar cell technology

© Fraunhofer IWM

Solar cells are multi-layered structures consisting of different materials. The different thermal expansion coefficients of silicon and the layer materials can create permanent warping in the solar cell. In industrial practice, the production machines can no longer process a solar cell with more than approx. 2 mm warp. In order to improve yield, we investigate the mechanical behavior and particularly the warping of solar cells with different electrode designs and describe these numerically, before assessing new, layered solar cell structures and optimizing them to minimize warp.