ELECTRONIC PRINCIPLES - OD1647 - LESSON 1/TASK 2
field which has been created by joining a section of N material
with a section of P material. Since holes and electrons must
overcome this field to cross the junction, the electrostatic
field is commonly called a BARRIER. Because there is a lack or
barrier, this area has become known as the DEPLETION REGION
therefore, aid current flow through the junction. To accomplish
this function, the external voltage is connected so that it
opposes the electrostatic field of the junction (figure 82 on
the following page).
is connected across a PN junction so that its voltage aids the
junction, thereby offering a high resistance to current flow
through the junction (figure 83 on the following page).