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Positive Feedback Organic-on-Silicon Upconversion Devices.

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This summary is machine-generated.

New hybrid optoelectronic upconversion devices enhance near-infrared light detection. These organic/silicon devices achieve significant photon-to-photon gain, paving the way for advanced imaging and computing applications.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Photonics

Background:

  • Positive feedback upconversion devices offer optoelectronic bistability and high photon-to-photon gain.
  • Applications include night vision and neuromorphic image classification.

Purpose of the Study:

  • Introduce a novel hybrid device architecture integrating an organic light-emitting diode (OLED) with an organic/silicon (Si) heterojunction photodiode.
  • Investigate the performance of these devices for near-infrared (NIR) light detection and upconversion.

Main Methods:

  • Fabrication of a hybrid device combining a tandem OLED with an organic/Si heterojunction photodiode.
  • Characterization of the device's response to NIR light up to 1.1 µm.
  • Analysis of gain, response speed, and crosstalk effects.

Main Results:

  • The hybrid devices respond to NIR light up to approximately 1.1 µm.
  • A peak photon-to-photon upconversion gain of 9x was achieved at input light intensity below 1 µW cm⁻².
  • Minimizing photodiode capacitance is crucial for maximizing response speed.
  • Electrical crosstalk in pixelated devices can lead to cascading effects.

Conclusions:

  • The developed hybrid architecture represents a significant advancement for optoelectronic upconverters compatible with Si microelectronics.
  • Overcoming electrical crosstalk is essential for practical pixelated devices.
  • Future work can extend responsivity into the further NIR by utilizing alternative inorganic semiconductor platforms like Germanium (Ge) or Indium Gallium Arsenide (InGaAs).