Monocrystalline panels are known for their higher efficiency and sleek black appearance, achieved through the use of single-crystal silicon cells, while polycrystalline panels offer a cost-effective alternative with a blue-speckled appearance, using silicon fragments melted together. When you evaluate solar panels for your photovoltaic (PV) system, you'll encounter two main categories of panels: monocrystalline solar panels (mono) and polycrystalline solar panels (poly). Both types produce energy from the sun, but there are some key differences to be aware of. They have a higher efficiency rating and perform better in hot temperatures, but are the most expensive option when it comes to residential solar panels. Single Crystal Solar Panels: Which Shines Brighter? Single Glass vs. Examine key performance metrics like efficiency, temperature.