Eneko Cereceda

• University of the Basque Country

This work features to simulate the effect of local defects in crystalline silicon solar cells by means of the 2D distributed model of the cell using the electronic simulation tool LTSpice®. For that, starting from locally laser damaged cells with known lumped characteristic parameters, the distributed parameters are obtained. The horizontal voltage...

Deviations from ideality on the behavior of solar cells can be studied by the local ideality factor defined as the inverse of the slope of the I-V characteristic curves. In this work the local ideality factor is used to characterize damaged cells from the point of view of a two-diode model. By means of the two-diode model, only what takes place in...

The laser isolation of p-n junction is the origin of electrical damage in solar cells. Although several models explain this effect, it is usual to appeal to complex recombination mechanisms to get an accurate representation of their non-ideal I-V behavior. Other models give to an accurate and simple explanation of this damage introducing a connecti...

Laser processes in solar cells are the origin of a considerable mechanical and electrical damage. This paper introduces a model that presents a good fitting to the laser-induced damage, previously characterized as an extra recombination diode, with a highly variable ideality factor, connected to the rest of the structure through an interconnecting...

Drilling process on wafers to produce EWT or MWT solar cells is a critical fabrication step, which affects on their mechanical stability. The amount of damage introduced during drilling process depends on the density of holes, their size and the chemical process applied afterwards. To quantify the relation between size of the holes and reduction of...

Mechanical stability of EWT solar cells deteriorates when holes are created in the wafer. Nevertheless, the chemical etching after the hole generation process improves the mechanical strength by removing part of the damage produced in the drilling process. Several sets of wafers with alkaline baths of different duration have been prepared. The mech...

Mechanical stability of back contact solar cells deteriorates when holes (MWT, EWT) or grooves (TWT) are created in the wafer. These operations are essential for these structures so we found necessary to quantify the magnitude of this damage. A set of wafers with the EWT structure was produced and its mechanical strength measured by the Ring on Rin...