High-efficiency solar panels have PERC cells (Passivated Emitter Rear Contact) and use advanced technologies like mono-crystalline silicon, multi-junction cells to minimize energy losses from solar panel reflections, thermal effects, and recombination. These types of solar panels overcome efficiency of twenty-five percent, lowering the required surface of the panel area for the desired power output. While the upfront costs of high efficiency panels are expensive, they are cost-efficient long-term due to generating more electricity per square meter, making them ideal for limited spaces.