After entering "hybrid propulsion rockets" in a search-engine website, i got these links in less than 0,5 second.
hybrid-propulsion.space
Hybrid Propulsion for Space
hybrid-propulsion.space
A hybrid rocket propulsion system comprises propellants of two different states of matter, the most common configuration being a rocket engine composed of a solid propellant lining a combustion chamber into which a liquid or gaseous propellant is injected so as to undergo a strong exothermic...
www.sciencedaily.com
What Is Hybrid Rocket Propulsion? | Basic Concepts Of Hybrid Rocket Propulsion | Advantages & Disadvantages Of Hybrid Rocket Propulsion | Hybrid Rocket Propulsion Safety
aerospacenotes.com
Like Ngatimozart already said, this is actually something you also could do, on the other hand ive learn today something about hybrid rocket propulsion...