Electronic structure of CoSi₂films on Si(111) studied using time-resolved two-photon photoemission

Abstract

The occupied and unoccupied electronic structure of thin epitaxial CoSi(2) films grown on Si(111) substrates was studied using time-resolved two-photon photoemission and valence-band photoemission spectroscopy. The work function of the sample surfaces and the Schottky barrier height at the metal-semiconductor interface were measured as a function of annealing temperature. The photoemission data reveal several occupied and unoccupied electronic states which exhibit a high sensitivity to the annealing temperature. Time-resolved measurements show a behavior typical for a short-lived hot-electron gas and indications for an image-potential resonance.

New Heteroleptic Cobalt Precursors for Deposition of Cobalt-Based Thin Films

“…4 In microelectronics, the applications of cobalt/cobalt-based thin films include their use as the lining material within interconnected trenches, 5 metallic interconnections, ohmic contacts in silicon-based devices, 6 and as Schottky contacts in the field of optoelectronics. 7 Thin films of cobalt and cobalt oxide are also useful as components of energy storage devices, such as LiCoO 2 in lithium-ion batteries. 8 In the last decades, cobalt-based thin films have gained a renewed interest in light of the discovery of giant magnetoresistance 9 and tunneling magnetoresistance 10 in multilayer structures for devices using these phenomena.…”

“…Cobalt is attractive because of its wide variety of applications, such as catalysis, protective coatings, magnetic information storage, and sensor systems . In microelectronics, the applications of cobalt/cobalt-based thin films include their use as the lining material within interconnected trenches, metallic interconnections, ohmic contacts in silicon-based devices, and as Schottky contacts in the field of optoelectronics . Thin films of cobalt and cobalt oxide are also useful as components of energy storage devices, such as LiCoO 2 in lithium-ion batteries .…”