Comprehensive analytical model for locally contacted rear surface passivated solar cells

摘要: For optimum performance of solar cells featuring a locally contacted rear surface, the metallization fraction as well size and distribution local contacts are crucial, since Ohmic recombination losses have to be balanced. In this work we present set equations which enable calculate trade off without need numerical simulations. Our model combines established analytical empirical predict energy conversion efficiency device. experimental verification, fabricate devices from float zone silicon wafers different resistivity using laser fired contact technology for forming contacts. The detailed characterization test structures enables determination important physical parameters, such surface velocity at area spreading resistance reproduces results very correctly predicts spacing use free fitting parameters. We our estimate bulk fabricated conventional Czochralski-grown material. These calculations literature values stable minority carrier lifetime account caused by formation boron-oxygen complexes under injection.