Experimental and Simulative Correlations of the Influence of Solder Volume and Receptor Size on the Capillary Self-Alignment of Micro Solar Cells

Vareilles, Victor; Kaiser, Elisa; Voarino, Philippe; Wiesenfarth, Maike; Cariou, Romain; Dimroth, Frank; Veschetti, Yannick; Amara, Mohamed; Helmers, Henning

doi:10.1109/jmems.2024.3352396

Cited by 2 publications

(1 citation statement)

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“…3(d) and (f) illustrates the dimensions to scale for the pads R C and R A . It has to be noted that (3) is a simplification and to explain the self-alignment behavior more accurate, numerical simulations are required, which is in preparation [27].…”

Section: A Cell Alignment Accuracies On Rectangular Receiving Pads 1)...mentioning

confidence: 99%

Forced Motion Activated Self-Alignment of Micro-CPV Solar Cells

Kaiser,

Wiesenfarth,

Vareilles

et al. 2024

IEEE J. Photovoltaics

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In micro-concentrating photovoltaics (micro-CPV), the size of solar cells is reduced (<1x1 mm 2 ) compared to conventional CPV. However, the quantity and requirement for placement accuracy of solar cells is increased. To be economically competitive, a promising possibility for the die assembly is a high throughput and relatively unprecise pick and place process combined with surface tension-driven self-alignment of the liquid solder. In this article, this approach is experimentally investigated, with a focus on the influences of solder volume, receiving pad layouts, and initial displacements of the cells on the self-alignment accuracy. Here, we show that an induced motion due to the initial displacement of the cells or due to solder flow along tracks leads to a more robust and accurate process. We found that less solder and rather smaller pads than cells (here by 92 µm or 10.4% of the cell length) are beneficial for self-alignment accuracy. However, for micro-CPV, conductor tracks connected to the pad are required for electrical interconnection and heat dissipation. Here, all cells are self-aligned and reach an accuracy between −15 and +15 µm, which is mainly due to the cell-to-pad size difference. Optical simulations show that this displacement would lead to an optical loss of 0.1% abs instead of 12.1% abs when displacing the cell by 150 µm. Thus, the self-alignment using the surface tension of the liquid solder leads to sufficient accuracy.

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Section: A Cell Alignment Accuracies On Rectangular Receiving Pads 1)...mentioning

confidence: 99%