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<p>Ruddlesden-Popper (RP) layered perovskite single crystals (SCs) have been widely utilized in high-performance and weather-resistant photodetectors (PDs) due to their unique properties, including highly anisotropic carrier transport, superior dark current suppression, and exceptional chemical stability. While the large-scale fabrication of RP layered perovskite SCs has been successfully achieved, the absence of systematic investigations into their mechanical strain properties poses a significant barrier to their application in flexible optoelectronic devices. This study introduces a polymer-SC-electrode-polymer lateral architecture PD, which employs a damage-free transfer technique to transfer centimeter-scale (C<sub>6</sub>H<sub>5</sub>C<sub>2</sub>H<sub>4</sub>NH<sub>3</sub>)<sub>2</sub>PbI<sub>4</sub> SC sheets (SC-sheets) with a thickness of ∼1 µm from rigid substrates to flexible electrode substrates. This transfer process is facilitated by an organic polymer solution solidification-based method. The lateral device configuration effectively exploits the in-plane high electrical conductivity of RP layered perovskites, achieving responsivity of 728 mA/W, on/off ratio of 1.6 × 10<sup>4</sup>, specific detectivity of 2.14 × 10<sup>13</sup> Jones, and external quantum efficiency of 222%. The self-sealing bilayer polymer sandwich structure imparts superior mechanical strain tolerance to the SCs, as demonstrated by mechanical bending tests that reveal an ultimate failure curvature radius of the SC-sheet in the range of 2.5–2.7 mm. Notably, even after superthreshold bending-induced fragmentation, the crystal segments maintain robust adhesion to electrodes through polymer chain interactions, thereby preserving efficient PD functionality. This work represents a significant advancement in the development of flexible optoelectronics based on RP layered SCs and expands their applicability in next-generation wearable devices.</p>

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Flexible photodetector based on transferred centimeter-sized Ruddlesden-Popper single-crystal sheet

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Zhenyu Zhang,
  • Guoping Wang

摘要

Ruddlesden-Popper (RP) layered perovskite single crystals (SCs) have been widely utilized in high-performance and weather-resistant photodetectors (PDs) due to their unique properties, including highly anisotropic carrier transport, superior dark current suppression, and exceptional chemical stability. While the large-scale fabrication of RP layered perovskite SCs has been successfully achieved, the absence of systematic investigations into their mechanical strain properties poses a significant barrier to their application in flexible optoelectronic devices. This study introduces a polymer-SC-electrode-polymer lateral architecture PD, which employs a damage-free transfer technique to transfer centimeter-scale (C6H5C2H4NH3)2PbI4 SC sheets (SC-sheets) with a thickness of ∼1 µm from rigid substrates to flexible electrode substrates. This transfer process is facilitated by an organic polymer solution solidification-based method. The lateral device configuration effectively exploits the in-plane high electrical conductivity of RP layered perovskites, achieving responsivity of 728 mA/W, on/off ratio of 1.6 × 104, specific detectivity of 2.14 × 1013 Jones, and external quantum efficiency of 222%. The self-sealing bilayer polymer sandwich structure imparts superior mechanical strain tolerance to the SCs, as demonstrated by mechanical bending tests that reveal an ultimate failure curvature radius of the SC-sheet in the range of 2.5–2.7 mm. Notably, even after superthreshold bending-induced fragmentation, the crystal segments maintain robust adhesion to electrodes through polymer chain interactions, thereby preserving efficient PD functionality. This work represents a significant advancement in the development of flexible optoelectronics based on RP layered SCs and expands their applicability in next-generation wearable devices.