CMOS-compatible fabrication of room-temperature Ge QD single hole transistors

Abstract

Precise control on quantum dot (QD) number and tunnel path in a self-organized manner is crucial for effective single electron tunneling. We experimentally demonstrated a single Ge QD (∼10 nm) self-aligned with nickel-silicide electrodes via Si3N4/SiO2 tunnel barriers by thermally oxidizing a SiGe nanorod. The fabricated Ge QD single hole transistor (SHT) features with clear differential conductance and Coulomb-blockade oscillation behaviors at near room temperature.