Long-wavelength photovoltage spectroscopy using an electrolyte/ semiconductor contact for semiconductor bandgap profiling

S. Y. Wang, K. A. Prior, B. C. Cavenett

Research output: Contribution to journalArticle

Abstract

In this paper we demonstrate, for the first time, that photovoltage spectroscopy (PVS) with an aqueous electrolyte/semoconductor contact can be extended to the wavelength range of 1-2 µm by using an optical fibre which comes directly into contact with the semiconductor, thus avoiding the strong absorption by the electrolyte which occurs in this spectral range. This technique is illustrated for lattice-matched In1-xGaxAs grown on lnP having a bandgap of 0.74 eV corresponding to ?g=1.67 µm. Thus carrier and composition depth profiling can be carried out on ternary and quaternary alloys used for 1.3 µm and 1.5 µm optoelectronic devices.

Original languageEnglish
Pages (from-to)1728-1730
Number of pages3
JournalSemiconductor Science and Technology
Volume8
Issue number9
DOIs
Publication statusPublished - Sep 1993

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