About how much incident light energy can a crystalline silicon solar cell convert into electricity?

Crystalline silicon solar cells have seen significant advancements in energy-conversion efficiency since their development. When the first silicon solar cell was demonstrated in 1954, it achieved an efficiency of 6 percent in direct sunlight. By the late 1980s, fabricated silicon cells had reached efficiencies exceeding 20 percent.1

The efficiency of these cells is determined by their ability to convert incident light into electricity through the photovoltaic effect, a process where photons excite electrons across the material's band gap. While the band gap defines a theoretical maximum efficiency, actual performance is limited by factors such as light reflection, electron-hole recombination, and crystal defects. To maximize energy capture, modern cells often utilize antireflection coatings and specialized surface treatments.32