

PCMs are already used but also have their limits. They’re heavy and only help if you’re consistently going through temperature swings like behind Earth’s shadow. Depending on your Beta angle, which changes as the earth revolves around the sun and your orbit precesses, you could be exposed to sun 24/7, so PCM wouldn’t help much.
Find a topic. Search for papers. Look at the journals the papers/citations are written in. It’ll be overwhelming clear which 2 or 3 journals dominate the space.