This article describes an inorganic solar cell prototype utilizing two types of cadmium nanocrystals. Do we really need to aim toward mass-producing more items that contain cadmium? This heavy metal is a toxin and carcinogen that is known for fast uptake in plants and buildup in animals’ fat. Risks associated with such a solar cell’s manufacture and disposal seldom seem to be discussed. Why not look for alternatives now rather than wait for problems later?

Valerie J. DelMedico
Columbus, Ohio