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Related Experiment Video

Updated: Mar 31, 2026

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Bandwidth improvement for germanium photodetector using wire bonding technology.

Guanyu Chen, Yu Yu, Shupeng Deng

    Optics Express
    |October 20, 2015
    PubMed
    Summary

    Researchers developed an ultrahigh-speed germanium photodetector. Specially designed gold wires in the ground electrodes doubled the photodetector

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    Area of Science:

    • Optoelectronics
    • Semiconductor devices
    • Photonics

    Background:

    • Photodetectors are crucial components in optical communication systems.
    • Germanium photodetectors offer excellent performance but are limited by bandwidth.
    • Parasitic parameters in device packaging can restrict high-frequency operation.

    Purpose of the Study:

    • To enhance the bandwidth of germanium photodetectors.
    • To overcome the limitations imposed by parasitic inductance in discrete ground electrodes.
    • To achieve ultrahigh-speed photodetection using standard fabrication techniques.

    Main Methods:

    • Introducing gold wires with specifically engineered inductance (approx. 450 pH) into discrete ground electrodes.
    • Utilizing standard wire bonding technology for integration.
    • Employing simulation and experimental validation to assess performance.

    Main Results:

    • The photodetector's bandwidth was effectively extended from below 30 GHz to over 60 GHz.
    • Parasitic parameters were successfully engineered through the tailored gold wire design.
    • Demonstrated feasibility of achieving ultrahigh-speed performance with a modified standard process.

    Conclusions:

    • The integration of engineered gold wires is a viable method for significantly boosting germanium photodetector bandwidth.
    • Standard wire bonding technology can be adapted for high-frequency optoelectronic device enhancement.
    • This approach offers a practical pathway towards next-generation, ultrahigh-speed optical communication systems.