Improved switching characteristics of p-type tin monoxide field-effect transistors through Schottky energy barrier engineering

Taikyu Kim, Jeong Kyu Kim, Baekeun Yoo, Hongwei Xu, Sungyeon Yim, Seung Hwan Kim, Hyun Yong Yu, Jae Kyeong Jeong

Research output: Contribution to journalArticle

Abstract

A low on-off current modulation ratio (ION/OFF) in p-type tin monoxide (SnO) field-effect transistors (FETs) is a critical bottleneck hampering their widespread application to transparent complementary metal oxide semiconductors (CMOSs) or monolithic integrated devices. To solve this problem, this study focuses on the source/drain (S/D) contact region. Also, a new perspective on the origin of the high off-current in SnO FETs, an electron injection from the drain electrode into the channel by Fermi-level pinning (FLP) at the off-state, is suggested. In this work, a metal-interlayer-semiconductor (MIS) S/D contact structure is adopted to suppress this adverse electron injection. An ultrathin interlayer (IL) of MIS contact alleviates metal-induced gap state (MIGS) penetration which is a primary cause of the severe FLP. A considerable enhancement is achieved by using the MIS contact structure: the off-current value decreased by approximately 20-fold from 5.1 × 10-8 A to 2.4 × 10-9 A; the ION/OFF value increased 10-fold from 2.7 × 102 to 2.8 × 103, which is interpreted by increased MIS contact-mediated electron SBH. This work presents a new approach that can be easily used alongside previously reported methods to suppress the off-current, providing enhanced switching capability of p-type SnO FETs using a simple method.

Original languageEnglish
Pages (from-to)201-208
Number of pages8
JournalJournal of Materials Chemistry C
Volume8
Issue number1
DOIs
Publication statusPublished - 2019 Jan 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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