Field emission-type electron source and method of biasing the same
摘要
<p>An electron source (10) has an electron source element (10a) including a lower electrode (12), a drift layer (6) and a surface electrode (7). The drift layer (6) is interposed between the lower electrode (12) and the surface electrode (7). When a certain voltage is applied between the surface electrode (7) and the lower electrode (12) such that the surface electrode (7) has a higher potential than that of the lower electrode (12), a resultingly induced electric field allows electrons to pass through the drift layer (6) and then the electrons are emitted through the surface electrode (7). When a forward-bias voltage is applied between the surface electrode (7) and the lower electrode (12), a reverse-bias voltage is applied after the forward-bias voltage has been applied to release out of the drift layer (6) an electron captured by a trap (9) in the drift layer (6). <IMAGE></p>
