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Additive-Engineered Dion-Jacobson Perovskites (4AMP)(FA)Pb2I7 for Self-Powered Efficient Photodetectors.

Abhishek Yadav1, Rashid M Ansari1, Shumile Ahmed Siddiqui2

  • 1Advanced Energy Materials Lab, Department of Physics, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan, India.

Small (Weinheim an Der Bergstrasse, Germany)
|March 25, 2026
PubMed
Summary

Additive engineering with MoS2 nanoflakes enhances quasi-2D Dion-Jacobson perovskites for efficient optoelectronics. This improves film morphology and charge transport, leading to record-performing self-powered photodetectors.

Keywords:
MoS2 Nanoflakesbulk‐heterojunctioncharge transfer networkoptical sensorquasi‐2D metal halide perovskitestransition metal dichalcogenides (TMDs)

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Dion-Jacobson (DJ) perovskites offer structural advantages over Ruddlesden-Popper (RP) perovskites for optoelectronic applications.
  • However, DJ perovskites suffer from poor film morphology and charge transport, limiting device efficiency.
  • Additive engineering is a promising strategy to overcome these limitations.

Purpose of the Study:

  • To demonstrate the additive engineering of quasi-2D (4AMP)(FA)Pb2I7 DJ perovskites using MoS2 nanoflakes.
  • To investigate the impact of MoS2 nanoflakes on the structural, chemical, optical, morphological, and optoelectronic properties of DJ perovskites.
  • To fabricate and characterize photodetectors utilizing these engineered DJ perovskites.

Main Methods:

  • Synthesis of quasi-2D DJ perovskites with varying concentrations of MoS2 nanoflakes.
  • Characterization of structural, chemical, optical, and morphological properties using techniques like XRD, SEM, and UV-Vis spectroscopy.
  • Fabrication and performance testing of self-powered photodetectors.

Main Results:

  • MoS2 nanoflakes promote epitaxial growth, leading to improved crystallographic orientation and reduced strain.
  • Optimized MoS2 addition resulted in compact film morphology and enhanced charge transport networks.
  • Photodetectors achieved record performance: R ~52.28 mA/W, D ~2.4 × 10^10 Jones, EQE ~13.79%.

Conclusions:

  • MoS2 nanoflakes effectively enhance the properties of quasi-2D DJ perovskites for optoelectronic applications.
  • The combination of DJ perovskites and transition-metal dichalcogenides (TMDs) shows significant potential for high-performance devices.
  • This work highlights a viable strategy for developing efficient, self-powered, charge transport layer-free photodetectors.