P-type semiconductor
A P-type semiconductor is a type of semiconductor. When a trivalent impurity (like Boron, Aluminum etc.) is added to an intrinsic or pure semiconductor (silicon or germanium), it is said to be a p-type semiconductor. Trivalent impurities such as boron (B), gallium (Ga), indium (In), aluminum (Al) etc. are called acceptor impurity. Ordinary semiconductors are made of materials that do not conduct (or carry) an electric current very well but are not highly resistant to doing so either, metalloids, such as Silicon (Si), Germanium (Ge), Arsenic (As), and a few other element commonly used for the main body of semiconductors. They fall halfway between conductors and insulators and so are called semiconductors. For an electric current to flow, electrons have to move through a material. In order to move, there must be an electron hole in the material for the electron to move into. A p-type semiconductor has more holes than electrons. This allows the current to flow along the material from hole to hole but only in one direction.