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High-Performance Phototransistor Based on a 2D Polybenzimidazole Polymer.

Anupam Prasoon1,2, Preetam Dacha3, Heng Zhang4

  • 1Center for Advancing Electronics Dresden (cfaed) and Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|June 1, 2025
PubMed

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Summary

A novel 2D polymer (2DPBI) with a porphyrin motif offers exceptional performance for photodetectors. This material achieves high charge carrier mobility and photoresponse, paving the way for advanced optoelectronic devices.

Area of Science:

  • Materials Science
  • Optoelectronics
  • Polymer Chemistry

Background:

  • Photodetectors are crucial for converting light to electrical signals in optoelectronics.
  • High-performance phototransistors require materials with excellent charge carrier mobility and photoresponse.
  • Achieving both properties simultaneously in a single material presents significant challenges due to inherent trade-offs.

Purpose of the Study:

  • To introduce a novel 2D polymer (2DPBI) with a π-conjugated photoresponsive porphyrin motif.
  • To synthesize few-layer, crystalline 2DPBI films with large domain sizes.
  • To investigate the optoelectronic properties and performance of 2DPBI in phototransistors.

Main Methods:

  • Synthesis of few-layer, crystalline 2DPBI films on a water surface.
Keywords:
2D polymerson‐water surface synthesisphotodetectorsphotoresponsive 2D polymersphototransistors

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  • Characterization using Terahertz spectroscopy and temperature-dependent photoconductivity measurements.
  • Fabrication and testing of 2DPBI-based phototransistors.

    • Main Results:

    • 2DPBI films exhibited large crystalline domain sizes (110–140 µm²) over a significant area (≈28 cm²).
    • The material possesses a narrow direct band gap (≈1.18 eV), high absorption coefficient (up to 10⁶ cm⁻¹), and excellent charge carrier mobility (≈240 cm² V⁻¹ s⁻¹).
    • 2DPBI phototransistors achieved high performance metrics: on/off ratio > 10⁸, photosensitivity of 1.08 × 10⁷, response time of 1.1 ms, and detectivity of 2.0 × 10¹³ Jones.

    Conclusions:

    • The synthesized 2DPBI demonstrates superior optoelectronic properties, including high charge carrier mobility and robust photoresponse.
    • 2DPBI-based phototransistors exhibit performance comparable to silicon and surpass other few-layer 2D materials.
    • 2DPBI represents a promising new material platform for the development of next-generation optoelectronic devices.