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Related Experiment Video

Updated: Dec 8, 2025

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Constructing Caesium-Based Lead-Free Perovskite Photodetector Enabling Self-Powered Operation with Extended Spectral

Amreen A Hussain1

  • 1Facilitation Centre for Industrial Plasma Technologies (FCIPT), Institute for Plasma Research (IPR), Gandhinagar, Gujarat 382428, India.

ACS Applied Materials & Interfaces
|September 18, 2020
PubMed
Summary

This study introduces a lead-free, inorganic perovskite Cs3Bi2I9 for photodetectors. The developed device demonstrates self-powered operation, high photosensitivity, and excellent long-term stability, overcoming lead toxicity and volatility issues in optoelectronics.

Keywords:
Cs3Bi2I9broadbandlead-freeperovskitephotodetectorself-powered

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Solid-State Physics

Background:

  • Hybrid halide perovskites show promise in optoelectronics but face challenges due to lead toxicity and organic constituent volatility.
  • Developing stable, lead-free alternatives is crucial for large-scale market adoption of perovskite-based devices.

Purpose of the Study:

  • To synthesize a robust, lead-free, inorganic halide perovskite, Cs3Bi2I9.
  • To investigate its material properties and potential for photodetector applications.
  • To fabricate and characterize a self-powered photodetector with enhanced stability and performance.

Main Methods:

  • Synthesis of Cs3Bi2I9 inorganic perovskite crystals.
  • Material characterization including crystalline quality and absorption coefficient analysis.
  • Fabrication of a photodetector device and performance evaluation under various conditions (zero-bias, light intensity, humidity).

Main Results:

  • Cs3Bi2I9 exhibits good crystalline quality, strong absorption, and micrometer-sized crystal morphology.
  • The fabricated photodetector operates in a self-powered mode with a low dark current (0.46 pA) and high photosensitivity (1.4 × 10^4).
  • The device shows broad spectral response (450-950 nm), high detectivity and responsivity, fast response speed, and remarkable photostability and long-term stability (90 days) under humid conditions.

Conclusions:

  • Cs3Bi2I9 is a promising lead-free, inorganic perovskite material for stable and efficient photodetector applications.
  • The developed self-powered photodetector offers comparable performance to lead-based devices, addressing toxicity and stability concerns.
  • This work paves the way for the development of environmentally friendly and robust optoelectronic devices.