Similarities in the optical properties of hexagonal and cubic InGaN quantum wells

S. F. Chichibu, M. Sugiyama, T. Onuma, T. Kuroda, A. Tackeuchi, T. Sota, T. Kitamura, H. Nakanishi, Y. Ishida, H. Okumura, S. Keller, U. K. Mishra, S. P. DenBaars, S. Nakamura

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Abstract

Optical properties of fully-strained wurtzite and zincblende InxGa1-xN/GaN multiple quantum well (MQW) structures were compared to discuss the origin of exciton localization. In contrast to the hexagonal InGaN MQWs, the photoluminescence (PL) peak energy of cubic InGaN MQWs showed a moderate blueshift with decreasing well thickness, L, and low-temperature PL decay time of the cubic MQWs did not depend strongly on L. The results imply that the wavefunction overlap in cubic InGaN MQWs was not reduced compared to the hexagonal ones, since they do not suffer from the electric field normal to the QW plane due either to spontaneous or piezoelectric polarization. Both MQWs exhibited a large and composition-dependent bandgap bowing, and time-resolved PL (TR-PL) signals showed a stretched-exponential decay even at room temperature. The exciton localization is considered to be an intrinsic property of InGaN.

Original languageEnglish
Pages (from-to)481-486
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume693
Publication statusPublished - 2002 Jan 1

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ASJC Scopus subject areas

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

Cite this

Chichibu, S. F., Sugiyama, M., Onuma, T., Kuroda, T., Tackeuchi, A., Sota, T., Kitamura, T., Nakanishi, H., Ishida, Y., Okumura, H., Keller, S., Mishra, U. K., DenBaars, S. P., & Nakamura, S. (2002). Similarities in the optical properties of hexagonal and cubic InGaN quantum wells. Materials Research Society Symposium - Proceedings, 693, 481-486.