Abstract
This chapter focuses on the space-charge-limited soild-state diodes. There is a very significant difference between single and double injection. In the single-injection diode there is only one type of carrier in the material, so that an appreciable space charge is developed, which strongly limits the current. In the double-injection diode there are two types of carriers of opposite charge in the material, so that their charges mostly neutralize each other; the net space charge is then much smaller than in the other case. As a consequence, the current density for the same dimensions and the same applied voltage is much larger than in the single-injection diode. In double-injection space-charge-limited diodes the characteristic is linear at low applied voltages (ohmic region), quadratic at intermediate applied voltages (semiconductor regime), and cubic at higher applied voltages (insulator regime).
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