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A Design Strategy for Low-Cost Single/Dual-Band Photodetector: Bulk Heterojunction and Interface Engineering.

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  • 1Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin, 150025, China.

Small (Weinheim an Der Bergstrasse, Germany)
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Summary

Researchers developed a novel perovskite bulk heterojunction photodetector. This device offers tunable band selection by controlling bias voltage, enabling selective light detection for advanced optoelectronics.

Keywords:
band‐selectivebulk heterojunctionperovskitephotodetectorunipolar barrier

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Device Physics

Background:

  • Band-selective photodetectors (PDs) are crucial for complex environments.
  • Current methods involve costly optical filters or complex multi-layer heterojunctions.
  • These approaches increase manufacturing expenses and integration challenges.

Purpose of the Study:

  • To develop a cost-effective, solution-processed photodetector with tunable band-selection capability.
  • To demonstrate a novel interface engineering strategy for selective carrier shielding.
  • To enable multifunctional optoelectronic applications.

Main Methods:

  • Fabrication of a perovskite bulk heterojunction (BHJ) photo-absorbing layer (MAPbI3:MA3Bi2I9).
  • Implementation of interface engineering to control photo-generated carrier tunneling.
  • Bias voltage regulation to tune the photodetector's spectral response.

Main Results:

  • The PD demonstrated broad photo-response in visible and near-infrared (NIR) regions at -0.3 V (e.g., 70.2 mA/W at 740 nm).
  • At 0.1 V, the PD selectively responded to visible light (3.7 mA/W at 500 nm) with a high rejection ratio (28.5).
  • Achieved fast response times (rise: 220 µs, fall: 240 µs).

Conclusions:

  • A novel, cost-effective strategy for fabricating multifunctional photodetectors was presented.
  • The developed perovskite BHJ PD offers tunable band-selection via bias control.
  • This technology is promising for future advanced optoelectronic systems.