Meaning
Electronic component consisting of two conducting layers separated by a very thin dielectric film that facilitates electron tunneling. The metals insulator metal diode functions as a high-speed switching element in thin-film circuits and rectennas. This structure relies on the quantum mechanical properties of the thin insulator.
Tunneling Mechanism
Current flow is governed by the ability of electrons to penetrate the energy barrier of the dielectric. A metals insulator metal diode exhibits a non-linear current-voltage relationship that is nearly independent of temperature. This behavior makes the device suitable for high-frequency detection in harsh environments where silicon-based diodes might fail.
Layer Fabrication
Sputtering or atomic layer deposition is used to create the nanometer-scale insulator between the metal electrodes. The metals insulator metal diode requires extremely smooth surfaces to prevent local electric field spikes that could cause premature breakdown of the dielectric. Variations in the thickness of the insulator directly change the sensitivity and response time of the diode.
Circuit Application
Rectification of terahertz signals is one of the primary applications for this technology. The metals insulator metal diode is integrated into antenna arrays to convert electromagnetic radiation into direct current. Because it does not rely on minority carrier lifetime, the device operates at speeds far exceeding those of conventional bipolar transistors.
