Multilayer (Al,Ga)N Structures for Solar-Blind Detection

Mauro Mosca, Jean-Luc Reverchon, Jean-Yves Duboz, Nicolas Grandjean, Mauro Mosca

Risultato della ricerca: Articlepeer review

32 Citazioni (Scopus)

Abstract

We report on solar-blind metal-semiconductor-metal (MSM) detectors fabricated on stacks of (Al,Ga)N layers with different AI mole fraction. These structures were grown by molecular beam epitaxy on sapphire substrates to allow backside illumination and a low-temperature GaN buffer layer. They consist of a 9-3-0.4-μm active layer grown on a thick (Al,Ga)N window layer (≈ 1 μm) that is transparent at the wavelength of interest. Different Al contents were used in the window layer. We observed that, in general, samples with a high Al content were cracked, which is explained in terms of mechanical strain. MSM photodetectors fabricated on these samples showed large leakage currents that were correlated with the crack density. In order to reduce the strain and eliminate the cracks, we inserted an AIN layer between the buffer and window layer. A crack-free sample was obtained and the solar-blind photodetector fabricated on this structure showed record performance.
Lingua originaleEnglish
pagine (da-a)752-758
RivistaIEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume10
Stato di pubblicazionePublished - 2004

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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