Why do monocrystalline solar cells have rounded/cropped edges?

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SUMMARY

Monocrystalline solar cells have transitioned from circular to square shapes primarily due to efficiency in packing and manufacturing. Square cells allow for better arrangement and utilization of space, maximizing energy output. The discussion highlights that the outer regions of the boule tend to form polycrystalline structures, making monocrystalline cells preferable for consistent performance. This design evolution reflects advancements in solar technology over the past 30 years.

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Homework Statement
Why do monocrystalline solar cells have rounded/cropped edges? And why do solar cells need to be square-shaped in general?
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There were circular solar cells 30 years ago. Why do we have square-shaped solar cells now? Why square now?
 
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Rectangles pack better than circles. Seems that individual cells also assume a rectangular shape. .
mono-and-poly-silicon-cells.jpg
 
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Way I understand it, the outside of the boule tends towards polycrystalline formation (mono is preferable).
 

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