Joel Jean PhD ’17 spent two years working on The Future of Solar Energy, a report published by the MIT Energy Initiative (MITEI) in 2015. Today, he is striving to create that future as CEO of Swift Solar, a startup that is developing lightweight solar panels based on perovskite semiconductors. It hasn’t been a straight path, but Jean says his motivation — one he shares with his five co-founders — is the drive to address climate change. “The whole world is finally starting to see the threat of climate change…