Crystalline perfection of epitaxial structure: Correlation with composition, thickness, and elastic strain of epitaxial layers

Balakrishnam R. Jampana, Nikolai N. Faleev, Ian T. Ferguson, Robert L. Opila, Christiana Honsberg

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

Abstract

Crystalline perfection of InGaN epi-layers is the missing design parameter for InGaN solar cells. Structural deterioration of InGaN epi-layers depends on the thickness, composition and growth conditions as well. Increasing the InGaN epi-layer thickness beyond a critical point introduces extended crystalline defects that hinder the optical absorption and electrical properties. Increasing the InGaN composition further reduces this critical layer thickness. The optical absorption band edge is sharp for III-nitride direct band gap materials. The band edge profile is deteriorated by creation of extended crystalline defects in the InGaN epitaxial material. The design of InGaN solar cells requires the growth of epi-layers where a trade off between crystalline perfection and optical absorption properties is reached.

Original languageEnglish (US)
Title of host publicationCompound Semiconductors for Energy Applications and Environmental Sustainability
Pages71-76
Number of pages6
StatePublished - Dec 1 2009
Event2009 MRS Spring Meeting - San Francisco, CA, United States
Duration: Apr 13 2009Apr 17 2009

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1167
ISSN (Print)0272-9172

Other

Other2009 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period4/13/094/17/09

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Jampana, B. R., Faleev, N. N., Ferguson, I. T., Opila, R. L., & Honsberg, C. (2009). Crystalline perfection of epitaxial structure: Correlation with composition, thickness, and elastic strain of epitaxial layers. In Compound Semiconductors for Energy Applications and Environmental Sustainability (pp. 71-76). (Materials Research Society Symposium Proceedings; Vol. 1167).