[Tade0]

Ultimately it's a semiconductor, so it's affected by the same aging processes that transistors and LEDs undergo. Actually, LEDs and solar cells are physically the same component, just designed for opposite use cases - much like motors and generators.

You can reasonably expect it to lose less than 1% of original efficiency a year, so they should last decades.

[lnsru]

I doubt there are many silicon based LEDs. So the both might be made from silicon, but they are definitely not the same component.