Solar cell efficiency refers to the amount of sunlight that a solar cell is able to convert into usable electricity. It is a key measure of the effectiveness of a solar cell in harnessing solar energy. Higher efficiency solar cells are able to generate more electricity from the same amount of sunlight, making them more cost-effective and efficient in converting solar energy into usable power. Researchers in this area focus on developing new materials, technologies, and manufacturing processes to increase the efficiency of solar cells and improve their performance. Improving solar cell efficiency is critical for increasing the adoption of solar energy as a renewable and sustainable source of power.