I am trying to understand the supply chain behind the Starlink Satellite Constellation. I am wondering how SpaceX is able to source those many solar panels. If somebody could give a brief explanation, it would be great.
At least some of the solar cells are (have been?) produced by Taiwan Solar Energy Corp See Starlinks Deepens Cooperations With Taiwan on Solar Cells, and a reddit discussion of that article.
The panels that Starlink uses are cheap, silicon based panels, similar to the ones that you might put on your roof, or even more similar to the ones that are in Tesla solar roof tiles. These are less durable in space, but the calculation is that an individual Starlink satellite has a short life expectancy, so the solar panel can be cheap.
There is no difficulty in producing this area of solar panel, the raw materials are easily available and the manufacturing process is mature. The choice of TSEC seems to be driven by a cost/quality analysis. TSEC are the cheapest that meet the Starlink specifications.
That article is a couple of years old now (and no longer available on the internet) It is possible that Starlink has a diversity of suppliers (to add resilience to it's supply chain).