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Updated: Dec 26, 2025

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Self-powered, all-solution processed, trilayer heterojunction perovskite-based photodetectors.

Muhammad Imran Saleem1,2, Shangyi Yang1,2,3, Ruonan Zhi1,2

  • 1Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic systems, Center for Micro-Nanotechnology, School of Physics, Beijing Institute of Technology, Beijing 100081, P. R. China.

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|March 10, 2020
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Summary
This summary is machine-generated.

A novel trilayer perovskite photodetector enhances performance by sandwiching cadmium sulfide nanorods. This design achieves an ultra-high On/Off ratio of 106, demonstrating potential for advanced self-powered optical sensors.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Heterostructures combining nano/micro-junctions offer improved photon harvesting and carrier transfer for photodetectors.
  • Perovskite materials show promise for high-performance optoelectronic devices.

Purpose of the Study:

  • To develop a highly sensitive, self-powered perovskite-based photodetector utilizing a trilayer heterojunction structure.
  • To investigate the impact of a CdS nanorod layer on interfacial charge carrier recombination and transport resistance.

Main Methods:

  • Fabrication of a trilayer photodetector: ITO/ZnO (70 nm)/CdS (150 nm)/CsPbBr3 (200 nm)/Au.
  • Characterization of device performance under 405 nm illumination at zero bias.
  • Analysis of electrical properties including On/Off ratio, responsivity, specific detectivity, and response time.

Main Results:

  • Achieved an ultra-high On/Off current ratio of 106.
  • Obtained a high responsivity of 86 mA W-1 and specific detectivity of 6.2 × 1011 Jones at zero bias.
  • Demonstrated fast response times with rise/decay of 0.3/0.25 s.

Conclusions:

  • The trilayer heterojunction design effectively reduces interfacial charge carrier recombination and transport resistance.
  • The fabricated perovskite photodetector exhibits excellent performance, highlighting its potential for high-performance applications.
  • This work demonstrates the viability of nano/micro-heterostructures for advanced self-powered photodetector technology.