P-type silicon is silicon doped with impurities that create an excess of holes, which act as positive charge carriers. The material remains electrically neutral overall; “p-type” describes which carriers dominate its electrical behavior. In a solar cell, it can form one side of a junction with n-type silicon, where electrons are the majority carriers.
The junction helps separate charges generated when light is absorbed, enabling a photovoltaic cell to produce electrical current. P-type silicon also appears in many semiconductor devices. Its properties depend on controlled doping and manufacturing, so impurities or inconsistent processing can affect device performance. In cyber security, understanding this material is relevant to assessing the hardware and supply chains behind technologies such as solar panels, though p-type silicon itself is not a cyber threat.