Passivation of GaAs surface recombination with organic thiols

Sharon R. Lunt; Patrick G. Santangelo; Nathan S. Lewis

doi:10.1116/1.585743

Passivation of GaAs surface recombination with organic thiols

Sharon R. Lunt, Patrick G. Santangelo, Nathan S. Lewis

California Institute of Technology

Research output: Contribution to journal › Article › peer-review

66 Citations (Scopus)

Abstract

Exposure of GaAs crystals to solutions of organic thiols resulted in substantial reductions in nonradiative GaAs surface recombination rates. This process yielded improvements in steady state photoluminescence signals that were comparable to those obtained after a Na₂S·9H₂O (aqueous) treatment. Use of a series of thiols indicated that the chemically important surface electrical trap levels behaved as a polarizable, electron deficient center. X-ray photoelectron spectroscopy indicated that the thiols did not remove excess As⁰ nor form detectable levels of As₂S₃-like phases, implying that neither of these factors is required for effective surface passivation chemistry.

Original language	English
Pages (from-to)	2333-2336
Number of pages	4
Journal	Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures
Volume	9
Issue number	4
DOIs	https://doi.org/10.1116/1.585743
Publication status	Published - Jul 1 1991

Keywords

Gallium arsenides
Passivation
Photoelectron spectroscopy
Photoluminescence
Recombination
Surfaces
Thiols

ASJC Scopus subject areas

Condensed Matter Physics
Electrical and Electronic Engineering

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abstract = "Exposure of GaAs crystals to solutions of organic thiols resulted in substantial reductions in nonradiative GaAs surface recombination rates. This process yielded improvements in steady state photoluminescence signals that were comparable to those obtained after a Na2S·9H2O (aqueous) treatment. Use of a series of thiols indicated that the chemically important surface electrical trap levels behaved as a polarizable, electron deficient center. X-ray photoelectron spectroscopy indicated that the thiols did not remove excess As0 nor form detectable levels of As2S3-like phases, implying that neither of these factors is required for effective surface passivation chemistry.",

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AU - Lunt, Sharon R.

AU - Santangelo, Patrick G.

AU - Lewis, Nathan S.

PY - 1991/7/1

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N2 - Exposure of GaAs crystals to solutions of organic thiols resulted in substantial reductions in nonradiative GaAs surface recombination rates. This process yielded improvements in steady state photoluminescence signals that were comparable to those obtained after a Na2S·9H2O (aqueous) treatment. Use of a series of thiols indicated that the chemically important surface electrical trap levels behaved as a polarizable, electron deficient center. X-ray photoelectron spectroscopy indicated that the thiols did not remove excess As0 nor form detectable levels of As2S3-like phases, implying that neither of these factors is required for effective surface passivation chemistry.

AB - Exposure of GaAs crystals to solutions of organic thiols resulted in substantial reductions in nonradiative GaAs surface recombination rates. This process yielded improvements in steady state photoluminescence signals that were comparable to those obtained after a Na2S·9H2O (aqueous) treatment. Use of a series of thiols indicated that the chemically important surface electrical trap levels behaved as a polarizable, electron deficient center. X-ray photoelectron spectroscopy indicated that the thiols did not remove excess As0 nor form detectable levels of As2S3-like phases, implying that neither of these factors is required for effective surface passivation chemistry.

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KW - Photoelectron spectroscopy

KW - Photoluminescence

KW - Recombination

KW - Surfaces

KW - Thiols

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