During this process, a whole new area is fashioned with the interface, called the depletion layer. A PN junction, when enclosed inside of a protecting casing and has exterior leads for electrical connections, varieties a PN junction diode. The time period first appeared while in the English language in 1804. https://www.uk-exhibitionstands.co.uk/future-of-exhibitions-key-trends-for-the-next-5-years/