As a preface I'm a scientist.

Neutrons and neutrinos are different classes of particles. I didn't get any results because you told me the wrong thing to search for. Cursory searches agree with what I said earlier, it's yet another goofy Tesla "free energy" pipe dream. Science has come incredibly far since the early 1900s, no one works as independent inventors or physicists anymore because we have huge institutions and advanced instruments to perform work as a collaboration. Neutrinos only interact with matter very weakly, as you said, so detecting them let alone setting up an absorber is technically challenging. On the other hand the sun gives off a huge amount of energy as electromagnetic waves so it hurts to look directly at it.

Research "photovoltaic solar energy" to learn more.