Modern solar panels operate through a sophisticated arrangement of multiple layers, each performing specific functions to ensure efficiency, durability, and safety. Each material's pān junction will produce electric current in response to different wavelengths of light. The use of multiple semiconducting materials allows the absorbance of a. Solar panel efficiency is constantly improving, and innovations in solar cell construction, materials, and design are at the forefront of these improvements. Most. Let's start with the solar industry's worst-kept secret ā 90% of rooftop photovoltaic panel installations use just one layer. Why? Imagine trying to wear three winter coats in July. Different types of solar.