(Negative) electron affinity of AlN and AlGaN alloys

Robert Nemanich, M. C. Benjamin, S. P. Bozeman, M. D. Bremser, S. W. King, B. L. Ward, R. F. Davis, B. Chen, Z. Zhang, J. Bernholc

Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • 34 Citations

Abstract

The electron affinity of a semiconductor defines the relationship of the vacuum level and the semiconductor band structure. It is dependent on the atomic orbitals of the material and the surface termination. We report experimental and theoretical results that support the presence of a negative electron affinity on AlN and the Al rich AlGaN alloys. The GaN surface is found to exhibit a (positive) electron affinity of 3.3eV. The experimental measurements employ UV-photoemission spectroscopy on in situ gas-source MBE samples and on CVD samples. Theoretical results indicate that the (negative) electron affinity of AlN depends sensitively on the surface reconstruction and adatom termination. The experimental dependence of the electron affinity on alloy concentration is presented. The results indicate that AlGaN alloys with band gap similar or greater than that of diamond will exhibit a negative electron affinity. Field emission results are reported, and the characteristics are similar to those obtained from a diamond film. Issues related to cold cathode electronic devices based on NEA surfaces are noted.

LanguageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
PublisherMaterials Research Society
Pages777-788
Number of pages12
Volume395
StatePublished - 1996
Externally publishedYes
EventProceedings of the 1995 MRS Fall Meeting - Boston, MA, USA
Duration: Nov 26 1995Dec 1 1995

Other

OtherProceedings of the 1995 MRS Fall Meeting
CityBoston, MA, USA
Period11/26/9512/1/95

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Electron affinity
Semiconductor materials
Diamond
Surface reconstruction
Adatoms
Diamond films
Positrons
Photoelectron spectroscopy
Ultraviolet spectroscopy
Molecular beam epitaxy
Field emission
Band structure
aluminum gallium nitride
Chemical vapor deposition
Diamonds
Energy gap
Cathodes
Gases
Vacuum

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Nemanich, R., Benjamin, M. C., Bozeman, S. P., Bremser, M. D., King, S. W., Ward, B. L., ... Bernholc, J. (1996). (Negative) electron affinity of AlN and AlGaN alloys. In Materials Research Society Symposium - Proceedings (Vol. 395, pp. 777-788). Materials Research Society.

(Negative) electron affinity of AlN and AlGaN alloys. / Nemanich, Robert; Benjamin, M. C.; Bozeman, S. P.; Bremser, M. D.; King, S. W.; Ward, B. L.; Davis, R. F.; Chen, B.; Zhang, Z.; Bernholc, J.

Materials Research Society Symposium - Proceedings. Vol. 395 Materials Research Society, 1996. p. 777-788.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Nemanich, R, Benjamin, MC, Bozeman, SP, Bremser, MD, King, SW, Ward, BL, Davis, RF, Chen, B, Zhang, Z & Bernholc, J 1996, (Negative) electron affinity of AlN and AlGaN alloys. in Materials Research Society Symposium - Proceedings. vol. 395, Materials Research Society, pp. 777-788, Proceedings of the 1995 MRS Fall Meeting, Boston, MA, USA, 11/26/95.
Nemanich R, Benjamin MC, Bozeman SP, Bremser MD, King SW, Ward BL et al. (Negative) electron affinity of AlN and AlGaN alloys. In Materials Research Society Symposium - Proceedings. Vol. 395. Materials Research Society. 1996. p. 777-788
Nemanich, Robert ; Benjamin, M. C. ; Bozeman, S. P. ; Bremser, M. D. ; King, S. W. ; Ward, B. L. ; Davis, R. F. ; Chen, B. ; Zhang, Z. ; Bernholc, J. / (Negative) electron affinity of AlN and AlGaN alloys. Materials Research Society Symposium - Proceedings. Vol. 395 Materials Research Society, 1996. pp. 777-788
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AU - Benjamin, M. C.

AU - Bozeman, S. P.

AU - Bremser, M. D.

AU - King, S. W.

AU - Ward, B. L.

AU - Davis, R. F.

AU - Chen, B.

AU - Zhang, Z.

AU - Bernholc, J.

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N2 - The electron affinity of a semiconductor defines the relationship of the vacuum level and the semiconductor band structure. It is dependent on the atomic orbitals of the material and the surface termination. We report experimental and theoretical results that support the presence of a negative electron affinity on AlN and the Al rich AlGaN alloys. The GaN surface is found to exhibit a (positive) electron affinity of 3.3eV. The experimental measurements employ UV-photoemission spectroscopy on in situ gas-source MBE samples and on CVD samples. Theoretical results indicate that the (negative) electron affinity of AlN depends sensitively on the surface reconstruction and adatom termination. The experimental dependence of the electron affinity on alloy concentration is presented. The results indicate that AlGaN alloys with band gap similar or greater than that of diamond will exhibit a negative electron affinity. Field emission results are reported, and the characteristics are similar to those obtained from a diamond film. Issues related to cold cathode electronic devices based on NEA surfaces are noted.

AB - The electron affinity of a semiconductor defines the relationship of the vacuum level and the semiconductor band structure. It is dependent on the atomic orbitals of the material and the surface termination. We report experimental and theoretical results that support the presence of a negative electron affinity on AlN and the Al rich AlGaN alloys. The GaN surface is found to exhibit a (positive) electron affinity of 3.3eV. The experimental measurements employ UV-photoemission spectroscopy on in situ gas-source MBE samples and on CVD samples. Theoretical results indicate that the (negative) electron affinity of AlN depends sensitively on the surface reconstruction and adatom termination. The experimental dependence of the electron affinity on alloy concentration is presented. The results indicate that AlGaN alloys with band gap similar or greater than that of diamond will exhibit a negative electron affinity. Field emission results are reported, and the characteristics are similar to those obtained from a diamond film. Issues related to cold cathode electronic devices based on NEA surfaces are noted.

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