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Revolutionizing Quinoidal Optoelectronics Through Heterojunction Engineering for Tri-Modal Reconfigurability

Yilin Zhao1, Jingwei Jiang2, Zhixin Hu3

  • 1Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Institute of Molecular Aggregation Science, Tianjin University, Tianjin, 300072, China.

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|November 24, 2025
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Summary
This summary is machine-generated.

Researchers developed a novel phototransistor using quinoidal small molecules (Q4T) and organic semiconductors. This device achieves broad spectral detection and high sensitivity, overcoming limitations of traditional quinoidal materials for advanced optoelectronics.

Keywords:
Organic electronicsQuinoidal compoundReconfigurabilityWide‐spectral

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Area of Science:

  • Organic electronics
  • Semiconductor physics
  • Materials science

Background:

  • Quinoidal-conjugated materials offer low LUMO levels and NIR-II absorption due to narrow bandgaps.
  • Poor charge transport in these materials limits simultaneous light absorption and carrier mobility optimization.
  • This restricts performance in UV-vis-NIR detection sensitivity and response speed.

Purpose of the Study:

  • To overcome the limitations of quinoidal semiconductors by developing a novel heterojunction phototransistor.
  • To achieve simultaneous optimization of light absorption and carrier mobility for enhanced optoelectronic performance.
  • To enable wide-spectral detection and versatile photoresponse characteristics.

Main Methods:

  • Fabrication of a heterojunction phototransistor combining n-type Q4T and p-type C10-DNTT.
  • Utilizing complementary absorption of heterogeneous semiconductors and type-II heterojunctions for efficient charge transfer.
  • Investigating tri-modal operational reconfigurability and spectrally resolved photoconductivity.

Main Results:

  • Achieved wide-spectral detection from 300 to 1200 nm.
  • Demonstrated a low detection threshold of 3 µW cm⁻² (high sensitivity) and a fast response time of 20 ms.
  • Enabled high-contrast image sensing and secure information encryption/decryption via gate-tunable modes.

Conclusions:

  • The heterojunction strategy effectively overcomes inherent limitations of quinoidal semiconductors.
  • The developed phototransistor serves as a versatile platform for all-organic bidirectional optoelectronic systems.
  • This work presents promising prospects for intelligent spectral sensing technologies.