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<p>Narrowband photodetectors exhibit considerable potential for high-resolution imaging and encrypted communication systems owing to their high spectral resolution capabilities. In this study, a composite perovskite single-crystal heterojunction (SCH) consisting of MAPbBr<sub>3</sub> and MAPbI<sub>3</sub> was fabricated by epitaxially growing MAPbI<sub>3</sub> on a MAPbBr<sub>3</sub> single crystal substrate. A carbon paste light-window electrode was applied to the MAPbI<sub>3</sub> surface following a spatially modulated electrode strategy. The resulting device demonstrates outstanding narrowband detection performance, featuring a full width at half maximum (<i>FWHM</i>) of 21&#xa0;nm, a spectral rejection ratio (<i>SRR</i>) of 137, a specific detectivity of 1.24 × 10<sup>11</sup> Jones (cm Hz<sup>1/2</sup>W<sup>−1</sup>), a responsivity of 0.56 A W<sup>−1</sup>, and a fast response time (34.86/42.81&#xa0;μs). The exceptional narrowband detection capabilities of this single-crystal heterojunction device would broaden the application prospects of perovskite-based photodetectors in the field of optoelectronics.</p>

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Fast response, narrow-band photodetector based on MAPbI3-MAPbBr3 single crystal heterojunctions

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Chaofan Guo,
  • Yiping Du,
  • Haoyang Guan,
  • Jinglong Zhu,
  • Lin Ma,
  • Zhengguang Yan,
  • Jiawen Xiao

摘要

Narrowband photodetectors exhibit considerable potential for high-resolution imaging and encrypted communication systems owing to their high spectral resolution capabilities. In this study, a composite perovskite single-crystal heterojunction (SCH) consisting of MAPbBr3 and MAPbI3 was fabricated by epitaxially growing MAPbI3 on a MAPbBr3 single crystal substrate. A carbon paste light-window electrode was applied to the MAPbI3 surface following a spatially modulated electrode strategy. The resulting device demonstrates outstanding narrowband detection performance, featuring a full width at half maximum (FWHM) of 21 nm, a spectral rejection ratio (SRR) of 137, a specific detectivity of 1.24 × 1011 Jones (cm Hz1/2W−1), a responsivity of 0.56 A W−1, and a fast response time (34.86/42.81 μs). The exceptional narrowband detection capabilities of this single-crystal heterojunction device would broaden the application prospects of perovskite-based photodetectors in the field of optoelectronics.