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Organic Zener diodes with a precisely adjustable reverse breakdown from -3 Vto -15 V without any influence on the forward current-voltage curve arerealized. This is accomplished by controlling the width of the charge depletionzone in a pin-diode with an accuracy of one nanometer independently of thedoping concentration and the thickness of the intrinsic layer. The breakdowneffect with its exponential current voltage behavior and a weak temperaturedependence is explained by a tunneling mechanism across the HOMO-LUMO gap ofneigh- boring molecules. The experimental data are confirmed by a minimalHamiltonian model approach, including coherent tunneling and incoherent hoppingprocesses as possible charge transport pathways through the effective deviceregion.

Organic Zener Diodes: Tunneling across the Gap in Organic Semiconductor Materials