Estimation of built-in voltage from steady-state current–voltage characteristics of organic diodes

• Extraction of built-in voltage from the steady-state current–voltage characteristics of a diode is described.
• Proposed method relies on current–voltage characteristics being exponential below built-in voltage and power-law above it.
• A sharply defined peak at a voltage proportional to built-in voltage is created.
• Proposed technique is less sensitive to presence of traps.

A technique for extraction of built-in voltage from the steady-state current–voltage characteristics of a two terminal organic diode is described which does not require assumption of quadratic dependence of current on voltage. The technique relies instead on current voltage characteristics being exponential below built-in voltage and power-law above it to generate a sharply defined peak at a voltage proportional to built-in voltage. Simulation results are used to validate the proposed method and experimental results obtained with P3HT and P3HT:PCBM blends are presented.

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