Electrical Characteristics of Schottky Diodes

Schottky diodes are rectifying metal–semiconductor junctions distinguished by their unipolar conduction and absence of minority‐carrier storage, which result in low forward voltage drop and rapid switching. Their performance is governed primarily by the Schottky barrier height and the ideality factor, which together dictate current–voltage behaviour under forward and reverse bias. Deviations from ideal thermionic emission arise from tunnelling, image‐force lowering, interface states and barrier inhomogeneity. Capacitance–voltage and temperature‐dependent measurements reveal the influence of interface charge and interfacial layers on depletion width and barrier uniformity. Modern developments exploit high‐k dielectrics, two‐dimensional materials and tailored insulating interlayers to modulate barrier properties, suppress leakage currents and extend operational frequency. These advances are critical for power rectifiers, radio‐frequency mixers, photodetectors and chemical sensors, underpinning the global push towards more efficient and compact electronic systems.

Research from Nature Portfolio

Recent work has derived and validated foundational current equations for silicon carbide Schottky diodes, showing that pure thermionic emission and tunnelling models can accurately reproduce measured I–V characteristics over wide temperature and voltage ranges when second‐order leakage and recombination effects are minimised. This study clarifies the interplay between barrier height, tunnelling probability and temperature dependence, and dispels common misconceptions regarding barrier inhomogeneity by demonstrating how uniform contacts can yield ideality factors close to unity across cryogenic to elevated temperatures.

Electrical Characteristics of Schottky Diodes publication trend

The graph below shows the total number of articles in electrical characteristics of schottky diodes across all publications each year (not limited to Nature Index journals).

Technical terms

Schottky barrier height: Energy barrier at the metal–semiconductor interface that carriers must overcome for conduction.

Ideality factor: Dimensionless parameter indicating deviation of diode I–V behaviour from the ideal thermionic emission model.

Thermionic emission: Carrier transport mechanism in which electrons surmount the barrier via thermal energy.

Poole–Frenkel emission: Field‐enhanced emission of trapped carriers from defect states within the depletion region.

Metal–insulator–semiconductor (MIS) structure: Device configuration incorporating an insulating layer at the metal–semiconductor junction to modify electrical characteristics.

References

1. Description and Verification of the Fundamental Current Mechanisms in Silicon Carbide Schottky Barrier Diodes. Scientific Reports (2019).
2. Metal oxide semiconductor-based Schottky diodes: a review of recent advances. Materials Research Express (2020).
3. On the electrical characteristics of Al/p-Si diodes with and without (PVP: Sn-TeO2) interlayer using current–voltage (I–V) measurements. Applied Physics A (2020).