Physics of the frequency response of rectifying organic Schottky diodes

Stephane Altazin (1) , Raphael Clerc (2) , Romain Gwoziecki (1) , Jean-Marie Verilhac (1) , Damien Boudinet (1) , Georges Pananakakis (3) , Gérard Ghibaudo (3) , Isabelle Chartier (1) , Romain Coppard (1)

1 LITEN - Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux
2 LHC - Laboratoire Hubert Curien
3 IMEP-LAHC - Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation

The frequency response of unipolar organic Schottky diodes used in a rectifying circuit, such as an RFID tag, has been investigated in detail. The time dependent response of rectifying circuits has been simulated solving both the Drift Diffusion and Poisson equations to model the hole transport within the diode, coupled with time dependent circuit equations. Several approximations have also been discussed. It turns out that the cut off frequency of the rectifying circuit is indeed limited by the carrier time-of-flight and not by the diode equivalent capacitance. Simulations have also been confirmed by comparison with experiments, involving diodes with different mobilities and thicknesses. This work confirms that the 13.56MHz frequency can be reached using polymer semiconductors, as already experimentally demonstrated in the literature, by an adequate control of the active layer thickness

Domaines: Micro et nanotechnologies/Microélectronique

Stephane Altazin, Raphael Clerc, Romain Gwoziecki, Jean-Marie Verilhac, Damien Boudinet, et al.. Physics of the frequency response of rectifying organic Schottky diodes. Journal of Applied Physics, 2014, 115, pp.064509. ⟨10.1063/1.4865739⟩. ⟨hal-00947497⟩