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For a novel cell concept based on the combination of silicon heterojunction (SHJ) with metal wrap through (MWT) metallization [1] a highly doped area underneath the metallization grid is required. In the past years, alternative processes for realizing defined doping profiles in n- and p-type silicon solar cells were published [2,3]. Laser doping offers the advantage of a locally confined heat impact causing diffusion of phosphor atoms into the molten silicon. Aim of this work is the development of a low cost laser-chemical doping process resulting in a shallow phosphor profile with high concentrations of electrically active phosphor on the surface. Application of the phosphor source and the diffusion of phosphor into the silicon is done in a one-step process with a single laser type. Sheet resistances of the laser doped areas are below 15 Ohm/square when using a pulsed wave (picosecond) laser source in the infrared region. [ABSTRACT FROM AUTHOR]

Abstract: E-mobility is still one of the most discussed topics within the automotive industry. Electric powered vehicles can drive emissionfree and present consequently the future propulsion. Nearly all global players in the automotive industry are making great efforts to develop cost-efficient electric drives, which are suitable for series production. The national governments support this evolution progressively. For example the mobility research programme of the Federal Republic of Germany looks at the production of Li- Ion cells in its entirety. Within this programme the cutting of electrodes for Li-Ion cells by lasers is an issue, too. This paper provides a comparative study on cutting materials relevant for Li-Ion cells with beam sources operating in a cw mode and a pulsed mode respectively. [Copyright &y& Elsevier]

Abstract: The development of high brightness lasers was pushed enormously in the last five years. Two different trends can be noticed. Beside the continuous growing laser power in the multi mode sector up to 100kW, diffraction limited laser systems are available in the range up to 10kW . High power diffraction limited lasers deliver a new quantity of laser power induced aberrations . Currently no online measurement equipment for optical aberrations is available. This paper describes an alternative online method to capture the optical aberrations of lenses. The developed tool allows a comparing benchmark of different optical components. [Copyright &y& Elsevier]