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    Researchers improved the performance of III-nitride vertical-cavity surface-emitting lasers (VCSELs) by using a novel AlGaN/GaN multiple quantum barrier (MQB) electron blocking layer (EBL). This enhancement significantly boosts output power and reduces threshold current density.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Semiconductor Physics

    Background:

    • III-nitride based vertical-cavity surface-emitting lasers (VCSELs) are crucial optoelectronic devices.
    • Conventional VCSELs often utilize a bulk AlGaN electron blocking layer (EBL).
    • Improving the efficiency and performance of VCSELs remains an active area of research.

    Purpose of the Study:

    • To demonstrate improved lasing performance in III-nitride VCSELs.
    • To investigate the effect of replacing a bulk AlGaN EBL with an AlGaN/GaN multiple quantum barrier (MQB) EBL.
    • To analyze the underlying mechanisms for performance enhancement.

    Main Methods:

    • Fabrication of III-nitride VCSELs with a conventional bulk AlGaN EBL.
    • Fabrication of III-nitride VCSELs with an AlGaN/GaN MQB EBL.
    • Experimental characterization of lasing performance, including output power and threshold current density.
    • Theoretical calculations to understand carrier dynamics and strain effects.

    Main Results:

    • The output power of VCSELs with the MQB-EBL was enhanced up to three times (0.3 mW to 0.9 mW).
    • The threshold current density was reduced from 12 kA/cm2 (9.5 mA) to 10.6 kA/cm2 (8.5 mA) with the MQB-EBL.
    • Theoretical calculations indicated improved carrier injection efficiency due to strain release and quantum interference in the MQB structure.

    Conclusions:

    • Replacing the bulk AlGaN EBL with an AlGaN/GaN MQB EBL significantly improves VCSEL lasing performance.
    • The MQB structure enhances carrier injection efficiency by increasing the effective conduction band barrier height.
    • This approach offers a promising strategy for developing high-performance III-nitride optoelectronic devices.