I think that solar cells in general are not a promising direction in the future
Are you serious? I think you were not interested in this topic. At the moment, the Ta'u Island has already been completely transferred to solar energy by Tesla.
Oh, it's interesting
You can find more information on the Internet. Ilon Mask plans to install solar power plants in Puerto Rico to restore damaged electrical infrastructure. And also has already installed in Australia the largest solar power station at the moment, with a capacity of 50 megawatts.