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Modified Uni-Traveling-Carrier Photodetector with Its Optimized Cliff Layer.

Xiaowen Dong1, Kai Liu1

  • 1State Key Laboratory of Information Photonics and Optical Communications, School of Electrical and Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China.

Sensors (Basel, Switzerland)
|April 13, 2024
PubMed
Summary

We optimized the MUTC-PD design by adjusting the cliff layer thickness to enhance electric field distribution. This MUTC-PD design achieves simultaneous high-speed and high-power performance, crucial for advanced optoelectronic applications.

Keywords:
electric-field pre-distortoptimized cliff layersaturation current density

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Electrical Engineering

Background:

  • High-speed and high-power photodetection is critical for modern communication and sensing systems.
  • Existing photodetector designs often face trade-offs between speed and power handling capabilities.
  • Electric field management within photodetectors significantly impacts their performance characteristics.

Purpose of the Study:

  • To design and simulate a novel photodetector, the MUTC-PD (Monolithic Ultrafast Traveling-Carrier Photodetector), with optimized performance.
  • To investigate the effect of cliff layer thickness on the electric field distribution and photocarrier dynamics.
  • To achieve simultaneous high-speed and high-power response in a single photodetector device.

Main Methods:

  • Device design and simulation of the MUTC-PD with varying cliff layer thicknesses.
  • Analysis of electric field pre-distortion and electron velocity saturation under increasing light power.
  • Characterization of differential capacitance and its relation to device bandwidth.
  • Simulation of 3 dB bandwidth and saturation RF output power at different configurations.

Main Results:

  • An optimized 70 nm cliff layer in a 16μm MUTC-PD significantly suppressed electric field collapse.
  • Simulations demonstrated a maximum 3 dB bandwidth of 137 GHz at -5 V, a substantial improvement over a 64 GHz device with a 30 nm cliff layer.
  • The device achieved a saturation RF output power of 27.4 dBm at 60 GHz, indicating excellent high-power handling.

Conclusions:

  • The optimized MUTC-PD design effectively enhances electron velocity and device bandwidth by managing electric field dynamics.
  • The MUTC-PD demonstrates a promising pathway for achieving simultaneous high-speed and high-power photodetection.
  • This design offers significant advancements for applications requiring superior optoelectronic performance.