ABSTRACT
Photoelectrochemical (PEC) cells are the most efcient cells for converting solar energy into a more useful form of energy. These devices are quite simple to construct, and often consist of a photoactive semiconductor electrode (either n-or p-type) and a metal counterelectrode. Both of these electrodes are immersed in a suitable redox electrolyte. The PEC cells use light to carry out a chemical reaction for converting light to chemical energy. They have a solid-liquid interface, whereas photovoltaic (PV) solar cells have a solid-solid interface.
