Amorphous cells are not made from crystals, but a thin layer of silicon vaporized on a base such as glass. Amorphous silicon is the most well developed of the thin film solar technologies, which include the CIGS and CdTe types. The Amorphous solar cells are the least expensive to manufacture and have the widest light absorption range making them great for low light situations and small wattage applications such as calculators, cell phone chargers, and car trickle chargers. When compared with mono-crystalline panels the amorphous panel can be up to 50% less efficient but easily half the cost making them extremely affordable. Generally, these cells will have a black to dark brown appearance.