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Title: Disorder induced interface states and their influence on the Al/Ge nanowires Schottky devices

It has been demonstrated that the presence of oxide monolayers in semiconductor surfaces alters the electronic potential at surfaces and, consequently, can drastically affect the electronic transport features of a practical device such as a field effect transistor. In this work experimental and theoretical approaches to characterize Al/germanium nanowire Schottky devices by using samples covered with a thin oxide layer (2 nm width) were explored. It was also demonstrated that the oxide layer on Ge causes a weak dependence of the metal work function on Schottky barrier heights indicating the presence of Fermi level pinning. From theoretical calculations the pinning factor S was estimated to range between 0.52 and 0.89, indicating a weak Fermi level pinning which is induced by the presence of charge localization at all nanowires' surface coming from interface states.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. NanO LaB - Departamento de Física, Universidade Federal de São Carlos, CEP 13565-905, CP 676 São Carlos, São Paulo (Brazil)
  2. Departamento de Física e Química, Faculdade de Engenharia de Guaratinguetá, Universidade Estadual Paulista Júlio de Mesquita Filho, CEP 12516-410 Guaratingueta, São Paulo (Brazil)
  3. Laboratório Interdisciplinar de Eletroquímica e Cerâmicas, Departamento de Química, Universidade Federal de São Carlos, CEP 135665-905, CP 676 São Carlos, São Paulo (Brazil)
Publication Date:
OSTI Identifier:
22267782
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIFFUSION BARRIERS; EQUIPMENT; FERMI LEVEL; FIELD EFFECT TRANSISTORS; GERMANIUM; OXIDES; QUANTUM WIRES; SEMICONDUCTOR MATERIALS; VENTILATION BARRIERS; WIRES; WORK FUNCTIONS