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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Related Experiment Video

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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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High Performance Lead-Free Perovskite-Based Photodetector for Low-Light Intensity Detection in Biomedical

Richa Srivastava1, Sudhanshu Verma1, Akhilesh Kumar Chaudhary1

  • 1Department of Electronics and Communication Engineering, Madan Mohan Malaviya University of Technology, Gorakhpur, Uttar Pradesh, India.

Luminescence : the Journal of Biological and Chemical Luminescence
|December 28, 2025
PubMed
Summary
This summary is machine-generated.

This study develops a lead-free perovskite photodetector for biomedical sensing. The optimized tin-based device shows high sensitivity for low-light applications.

Keywords:
COMSOL Multiphysics DetectivitySCAPS‐1Dcharge transport layerslead‐free perovskite materialphotodetectorresponsivity

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Biomedical Engineering

Background:

  • Lead-based perovskites offer high performance but pose environmental risks.
  • There is a growing need for sensitive, eco-friendly photodetectors in biomedical applications.

Purpose of the Study:

  • To numerically investigate and optimize a lead-free, tin-based perovskite photodetector (PPD) for low-light biomedical sensing.
  • To explore the potential of CH3NH3SnBr3 as a sustainable alternative to lead-based materials.

Main Methods:

  • Device simulation using SCAPS-1D and COMSOL Multiphysics.
  • Systematic investigation of absorber thickness, defect density, doping, electric field, resistances, and interface properties.
  • Modeling of a FTO/CdZnS/CH3NH3SnBr3/Spiro-OMeTAD/Au device architecture.

Main Results:

  • Optimized PPD achieved a peak responsivity of 0.55 A/W and detectivity of 9.7 × 10^14 Jones.
  • High performance was observed within the red-light spectral window (680-790 nm).
  • Enhanced charge carrier lifetimes and effective interfacial charge extraction were demonstrated.

Conclusions:

  • CH3NH3SnBr3 is a promising eco-friendly material for high-performance perovskite photodetectors.
  • The developed PPD design shows significant potential for advancing biomedical imaging and diagnostics.
  • This work contributes to the development of sensitive, low-illumination photodetectors for healthcare.