Crystalline Silicon is the most established solar technology, known for high efficiency, durability, and wide use in solar panels. It comes in two main types: Monocrystalline Silicon (Mono-Si) and Polycrystalline Silicon (Poly-Si). Mono-Si offers higher efficiency and performance, particularly in limited spaces, while Poly-Si is more cost-effective. Advanced variants like PERC (Passivated Emitter and Rear Cell) and bifacial modules improve energy capture and performance, making c-Si ideal for BIPV applications, especially where reliability and long-term performance are critical.