Improved MBE-grown GaAs using a novel, high-capacity Ga effusion cell

R. N. Sacks*, P. Colombo, George A. Patterson, Kathleen A. Stair

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

A novel PBN crucible has allowed the design of a new high-capacity Ga source incorporating a unique heat shielding cap. The extra heat shielding at the front of the source allows hot lip operation with considerably lower power than for previous designs, thus completely eliminating Ga droplets without an inordinately high heat load. Compared with another high-capacity, low-flux transient cell (an EPI 125DF), the new source operated with significantly less power and produced lower defect densities. Specifically, defect densities of 22-27 defects/cm2 for ∼ 1 μm thick GaAs layers have been obtained with the new source, compared with 88-92 defects/cm2 from the 125DF. In addition, an 18.7 μm thick GaAs layer grown with the new cell had only 277 defects/cm2. The new source also produced GaAs with low background doping ( < 2 × 1013/cm3), low total trap density ( < 2.0 × 1012/cm3), and good uniformity over a 3 in diameter wafer (center-to-edge decrease in GaAs thickness of ∼ 2.2%). It also exhibited low flux transients ( < 2%) and low-long term drift.

Original languageEnglish (US)
Pages (from-to)66-71
Number of pages6
JournalJournal of Crystal Growth
Volume175-176
Issue numberPART 1
DOIs
StatePublished - Jan 1 1997

Keywords

  • Gallium arsenide
  • Molecular beam epitaxy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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