Changes in electron and hole traps in GaN-based light emitting diodes from near-UV to green spectral ranges

In Hwan Lee, A. Y. Polyakov, N. B. Smirnov, R. A. Zinovyev, Kang Bin Bae, Tae Hoon Chung, Sung Min Hwang, J. H. Baek, S. J. Pearton

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25 Citations (Scopus)


Deep electron and hole traps were studied by admittance spectroscopy (AS) and deep level transient spectroscopy (DLTS) with electrical and optical (ODLTS) injection for GaN-based multi-quantum-well (MQW) light emitting diodes (LEDs) operating in the near-UV (385-390 nm), blue (445 nm), and green (515 nm) spectral regions. AS spectra were dominated by freezing out of Mg acceptors at temperatures around 150 K, by shallow centers in the MQW region, and, for green LEDs, by deeper electron traps with a level near Ec − 0.27 eV located in the MQW region. DLTS spectra showed electron traps with levels Ec − 0.8 eV (NUV), Ec − 0.5 eV (blue), Ec − 0.6 eV (blue and NUV), and Ec − 0.27(green LEDs). In ODLTS, hole traps near Ev + 0.75 eV (NUV), Ev + 0.65 eV (blue), and Ev + 0.45 eV (green LEDs) originating in the quantum well (QW) region were detected (the QW character was confirmed by using excitation light that generated electron-hole pairs only within the QWs). The levels of the electron and hole traps in LED structures differing in the In composition in the QWs were well aligned with respect to the vacuum level.

Original languageEnglish
Article number192107
JournalApplied Physics Letters
Issue number19
Publication statusPublished - 2017 May 8

Bibliographical note

Funding Information:
The work at NUST MISiS was supported in part by the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST “MISiS” (К2-2014-055). The work at Korea University was supported by the Technology Innovation Program (10053288) funded by the Ministry of Trade, Industry and Energy (MOTIE), Korea. The work at UF was supported by HDTRA1-17-1-001.

Publisher Copyright:
© 2017 Author(s).

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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