What Is the Causal Story of Solar Cell Development?

The cost of a solar panel is about one five thousandth of what it was when it was used in the first vanguard satellite in 19 58. But there have been periods where the price went up due to material shortages. The long term uncertainty is always the uncertainty in perimeters, cause that grows faster with time. What's causing the bumps in the roa sulphur solar energy? We're not saying anything about the bumps.