Renal agenesis. Renal agenesis is a medical condition in which one (unilateral) or both (bilateral) fetal kidneys fail to develop.
Polycrystalline cells are composed of multiple silicon crystals, which is a cheaper way to manufacture solar modules. Put simply, these cells are easier for a factory to produce, so they are less expensive. Polycrystalline cells are made by several methods, but most commonly with a cast of molten silicon.
It can be obtained in the form of a single crystal or as polycrystalline material. In general, polycrystalline germanium is less expensive and is available in larger sizes than. monocrystalline material. In a number of cases, it is worthwhile for an optical designer/fabricator to consider which material class. is the better choice for a particular application.