Electrical and optical characterization of Au/CaF2/p-Si(111) tunnel-injection diodes

Abstract

Metal/CaF2/p-Si(111) capacitors with the improved-quality several-nanometer-thick epitaxial fluorite films are examined, aiming at solidifying a candidacy of this material for barrier layers in silicon devices. Structural and transport properties of a thin crystalline dielectric are characterized by different experimental techniques. The measured current-voltage characteristics accompanied with simulation results demonstrate that the elastic tunneling electron injection takes place in the considered structures. The same result follows from the behavior of hot-electron-injection-related electroluminescence within the selected spectral intervals. The result is important considering a perspective of using the epitaxial fluorides as barrier layers in resonant tunneling diodes.

Dielectric Properties of Ultrathin CaF2 Ionic Crystals

“…The CaF 2 film was grown on this surface by MBE at 250 °C, which is known to be the optimum temperature to produce pinhole-free homogeneous CaF 2 layers. [30] The deposition rate of CaF 2 measured by a quartz oscillator was ≈1.3 nm min −1 . The growth processes and crystalline quality of the CaF 2 layers were monitored using reflection high-energy electron diffraction, with an electron energy of 15 keV.…”

Insulators for 2D nanoelectronics: the gap to bridge

“…Crystalline materials theoretically provide the largest potential for obtaining defect-free insulators and overcoming problems associated with both interface quality and defect bands. The most promising results for 2D FETs have recently been obtained for crystalline layered 2D insulators, in particular hBN 108,125 and mica 126 , as well as the ionic crystal CaF 2 46,62,127,128 . These materials and some other known fluorides are summarized in Fig.…”

Surface defect‐enhanced conductivity of calcium fluoride for electrochemical applications

“…Relevant interest remains to recognize and understand proper defect formation . It is applied to chemical sensors and gains importance for electronic applications . However, sustaining demand for high‐power and high‐energy‐density battery systems has spurred extensive research in developing novel electrode and electrolyte materials for next‐generation battery systems .…”