Effect of electrode resistance on admittance spectra of planar organic device carrying SCLC and on charge carrier mobility extracted from susceptance

• Electrode-resistance effect on admittance/capacitance of SCLC system is analyzed.
• The resistance can affect both parts of small signal response.
• Real-capacitance maximum decreases from geometric capacitance to lower values.
• The resistance can affect values of charge carrier mobility extracted from susceptance.

The work describes small signal admittance spectra of a real planar system with a thin organic layer carrying a space charge limited current. Our theoretical model includes electrode resistance. The analysis performed shows that the series resistance can affect both parts of small signal response within a whole range of frequency. The resistance can also influence the value of charge carrier mobility extracted from susceptance. This effect is not trivial and can be observed for higher values of applied voltage.

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