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Space Charge Limited SCL Currents

Figure 107 Mobility-dependent hole injection currents for six TPD PC samples at 0.4MV/cm, under space-charge-limited O scl) and injection-controlled O inj) conditions. Inset mobility dependence of the injection efficiency defined by the ratio 0ilc/7scl)-After Ref. 394. Copyright 2001 American Physical Society. Figure 107 Mobility-dependent hole injection currents for six TPD PC samples at 0.4MV/cm, under space-charge-limited O scl) and injection-controlled O inj) conditions. Inset mobility dependence of the injection efficiency defined by the ratio 0ilc/7scl)-After Ref. 394. Copyright 2001 American Physical Society.
Blom et al. [85] stated that the I/V characteristics in LEDs based on ITO/di-alkoxy-PPVs/Ca are determined by the bulk conductivity and not by the charge carrier injection, which is attributed to the low barrier heights at the interface ITO/PPV and PPV/Ca. They observed that the current flow in so called hole-only devices [80], where the work function of electrodes are close to the valence band of the polymer, with ITO and Au as the electrodes, depends quadratically on the voltage in a logl/logV plot and can be described with following equation, which is characteristic for a space-charge-limited current (SCL) flow (s. Fig. 9-26) ... [Pg.291]

Space-charge-limited current is /scl- So, one natural way of evaluating the hole injection efficiency, ii, is to compute the ratio [71] ... [Pg.101]

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Charge charging current

Charge current

Current charged

Current limit

Limitation current

Limited currents

Limiting charge

Limiting currents

Space charge limit

Space charging

Space-charge

Space-charge-limited

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