Two-dimensional electron gas related emissions in ZnMgO/ZnO heterostructures

Hui Chen*, Shulin Gu, Jiagao Liu, Jiandong Ye, Kun Tang, Shunming Zhu, Youdou Zheng

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    31 Citations (Scopus)


    Radiative recombination of two-dimensional electron gas (2DEG), induced by polarization and validated by Hall effect measurements, is investigated in ZnMgO/ZnO heterostructures grown by metal-organic chemical vapor deposition. The Mg composition, the depth profile distribution of Mg, the residual strain in ZnMgO caplayer, and the thickness of caplayer all significantly influence the 2DEG-related transitions in ZnMgO/ZnO heterostructures. Below or above ZnO donor bound exciton, three additional broad emissions persisting up to 100 K are assigned to the spatially indirect transitions from 2DEG electrons to the photoexcited holes towards the ZnO flat-band region or remaining at the heterointerface.

    Original languageEnglish
    Article number211906
    JournalApplied Physics Letters
    Issue number21
    Publication statusPublished - 21 Nov 2011


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