Limiting factors of room-temperature nonradiative photoluminescence lifetime in polar and nonpolar GaN studied by time-resolved photoluminescence and slow positron annihilation techniques

S. F. Chichibu, A. Uedono, T. Onuma, Takayuki Sota, B. A. Haskell, S. P. Denbaars, J. S. Speck, S. Nakamura

    Research output: Contribution to journalArticle

    99 Citations (Scopus)

    Abstract

    Room-temperature nonradiative lifetime (τnr) of the near-band-edge excitonic photoluminescence (PL) peak in {0001} polar, (11 2̄0), (1 1̄ 00), and (001) nonpolar GaN was shown to increase with the decrease in density or size of Ga vacancies (VGa) and with the decrease in gross density of point defects including complexes, leading to the increase in the PL intensity. As the edge threading dislocation density decreased, density or size of VGa tended to decrease and τnr tended to increase. However, there existed remarkable exceptions. The results indicate that nonradiative recombination process is governed not by single point defects, but by certain defects introduced with the incorporation of VGa, such as VGa -defect complexes.

    Original languageEnglish
    Article number021914
    JournalApplied Physics Letters
    Volume86
    Issue number2
    DOIs
    Publication statusPublished - 2005 Jan 10

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    positron annihilation
    photoluminescence
    life (durability)
    room temperature
    point defects
    defects
    edge dislocations

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Limiting factors of room-temperature nonradiative photoluminescence lifetime in polar and nonpolar GaN studied by time-resolved photoluminescence and slow positron annihilation techniques. / Chichibu, S. F.; Uedono, A.; Onuma, T.; Sota, Takayuki; Haskell, B. A.; Denbaars, S. P.; Speck, J. S.; Nakamura, S.

    In: Applied Physics Letters, Vol. 86, No. 2, 021914, 10.01.2005.

    Research output: Contribution to journalArticle

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    AU - Uedono, A.

    AU - Onuma, T.

    AU - Sota, Takayuki

    AU - Haskell, B. A.

    AU - Denbaars, S. P.

    AU - Speck, J. S.

    AU - Nakamura, S.

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