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  3. Microconcave Mapbbr3 Single Crystal For High-performance Photodetector.
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  3. Microconcave Mapbbr3 Single Crystal For High-performance Photodetector.

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Microconcave MAPbBr3 Single Crystal for High-Performance Photodetector.

Han Liu1, Xiangfeng Wei1, Zhixiang Zhang1

  • 1Future Energy Laboratory, School of Materials Science and Engineering, School of Electronic Science and Applied Physics , Hefei University of Technology , Hefei 230009 , China.

The Journal of Physical Chemistry Letters
|February 7, 2019

View abstract on PubMed

Summary
This summary is machine-generated.

Researchers developed a novel suspension method for cubic methylammonium lead bromide (MAPbBr3) crystals with microconcave surfaces. These MAPbBr3 photodetectors show significantly enhanced photoelectric performance, including superior responsivity and detectivity.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Crystallography

Background:

  • Single crystals of methylammonium lead bromide (MAPbBr3) are crucial for optoelectronic applications.
  • Existing methods for crystal fabrication often result in planar surfaces, limiting device performance.
  • Surface morphology significantly impacts charge carrier dynamics and light interaction in photodetectors.

Purpose of the Study:

  • To report a new suspension method for fabricating cubic MAPbBr3 single crystals with microconcave surfaces.
  • To investigate the impact of microconcavity on crystal quality and carrier lifetime.
  • To evaluate the photoelectric performance of photodetectors based on these novel MAPbBr3 crystals.

Main Methods:

  • Development of a novel suspension method for cubic MAPbBr3 single crystal growth.
  • Characterization of crystal crystallinity and carrier lifetime.
  • Fabrication and testing of photodetectors utilizing concavity-based MAPbBr3 crystals.
  • Performance evaluation under varying light intensities (3.67 μW cm⁻² and 35.4 mW cm⁻²) at 520 nm.

    • Main Results:

    • The microconcave MAPbBr3 crystals exhibit good crystallinity and extended carrier lifetime.
    • Concavity-based photodetectors demonstrate enhanced light trapping and shorter carrier pathways.
    • Superior responsivity (62.9 A/W and 5.43 A/W) and EQE (1.50 × 10⁴% and 1.30 × 10³%) were achieved under low and high power irradiation, respectively.
    • An ultrahigh detectivity of 6.5 × 10¹² Jones was recorded at ultralow power (3.67 μW cm⁻²), significantly outperforming planar devices.

    Conclusions:

    • The novel suspension method successfully produces MAPbBr3 single crystals with microconcave surfaces.
    • Microconcavity enhances light trapping and carrier transport, leading to superior photodetector performance.
    • This approach offers a promising pathway for developing high-performance optoelectronic devices.