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High Dynamic Range CsFAPbI3 Perovskite Photodetectors with 12.7 MHz Bandwidth.

Abdul Mannan Majeed1, Sandra Stanionytė2, Gediminas Kreiza1

  • 1Institute of Photonics and Nanotechnology, Faculty of Physics, Vilnius University, Sauletekio Ave. 3, LT-10257 Vilnius, Lithuania.

Materials (Basel, Switzerland)
|April 14, 2026
PubMed
Summary

We developed cesium (Cs) content-tuned perovskite photodetectors for stable visible-light photodetection. The CsxFA1-xPbI3 composition with x=0.2 offers excellent stability and fast response times, suitable for cost-efficient light detection systems.

Keywords:
bandwidthperovskite photodetectorsresponsivity

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Solid-State Physics

Background:

  • Perovskite materials offer promising optoelectronic properties for photodetector applications.
  • Developing stable perovskite compositions is crucial for reliable device performance.
  • Cesium (Cs) incorporation is a strategy to enhance perovskite stability.

Purpose of the Study:

  • To identify the most stable cubic-lattice perovskite composition for visible-light photodetection.
  • To optimize CsxFA1-xPbI3 for enhanced photodetector performance.
  • To evaluate the suitability of these perovskites for cost-efficient light detection systems.

Main Methods:

  • Fabrication of CsxFA1-xPbI3 perovskite photodetectors with varying Cs content (x = 0.05-0.25) using spin-coating.
  • Structural characterization using X-ray diffraction (XRD) and scanning electron microscopy (SEM).
  • Photoresponse and transient response measurements under varying excitation power and picosecond pulsed lasers.

Main Results:

  • CsxFA1-xPbI3 compositions with x = 0.1-0.2 exhibited the most stable lattice and pinhole-free layers.
  • Photodetectors showed linear photocurrents over a wide excitation power range (1 nW-10 mW).
  • Achieved a photoresponsivity of 0.28 A/W at 532 nm, comparable to silicon photodiodes.
  • The x = 0.2 composition demonstrated a fast rise time of 27.5 ns, enabling a modulation bandwidth of 12.7 MHz.

Conclusions:

  • The CsxFA1-xPbI3 perovskite with x = 0.2 is a highly stable and efficient material for visible-light photodetection.
  • These perovskite photodetectors offer performance comparable to silicon photodiodes with potential for faster response.
  • The developed photodetectors are suitable for cost-efficient applications in imaging and light communication, such as Li-Fi.