A simple parallel conduction extraction method (SPCEM) for MODFETs and undoped GaN-based HEMTs

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LİŞESİVDİN S. B., Balkan N., Ozbay E.

MICROELECTRONICS JOURNAL, vol.40, no.3, pp.413-417, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 40 Issue: 3
  • Publication Date: 2009
  • Doi Number: 10.1016/j.mejo.2008.06.006
  • Journal Name: MICROELECTRONICS JOURNAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.413-417
  • Keywords: Parallel conduction, Mixed conduction, Multi-carrier, MODFET, HEMT, QMSA, MOBILITY-SPECTRUM ANALYSIS, FIELD-EFFECT TRANSISTORS, MAGNETOTRANSPORT CHARACTERIZATION, MICROWAVE PERFORMANCE, ELECTRON-GAS, HETEROSTRUCTURES, HETEROJUNCTIONS, TRANSPORT, HGCDTE, DONORS
  • Gazi University Affiliated: Yes

Abstract

We report a simple method to extract the mobility and sheet carrier densities of conduction channels in conventional modulation doped field-effect transistor (MODFET) structures and unintentionally doped GaN-based high-electron mobility transistor (HEMT) structures for a special case. Extraction of the conduction channels from the magnetic field-dependent data can present number of problems; even the most recent methods encounter great difficulties. For the GaN-based HEMT structures which have lower mobilities and larger effective masses than that of GaAs-based counterparts, these difficulties become more prominent. in this study, we describe a simple method for magnetotransport analysis to extract conduction channels successfully for a special case that is commonly encountered: one bulk channel and one two-dimensional electron gas (2DEG) channel. Advantage of this method is mainly its simplicity. The analysis can be done with only two magnetic field-dependent measurements per temperature step. The method is applied to the magnetotransport results of an unintentionally doped AlGaN/AlN/GaN/AIN heterostructure over a temperature range of 29-350 K and in a magnetic field range of 0-1.5 T (mu B < 1). The results are then compared with those obtained using a commercial package for these calculations namely: quantitative mobility spectrum analysis (QMSA). (C) 2008 Elsevier Ltd. All rights reserved.