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<p>Single-crystal (SC) structures have long been regarded as the optimal configuration for metal halide perovskite photodetectors (PDs); however, their applications in large-area imaging and wearable electronics face limitations due to size constraints and mechanical inflexibility. To address these challenges, this study develops a hybrid composite structure—polycrystalline powder (PCP) matrix (PCPM)—by strategically homogenizing 20 µm PCPs within a poly(methyl methacrylate) matrix. Such a configuration enables the formation of densely packed PCP microstructures while maintaining electric conductivity and mechanical flexibility. In the single-photon regime, responsivity (<i>R</i>) and external quantum efficiency (EQE) decline by 50%, with concurrent 3–4-fold enhancements in the On/Off ratio and 12–16-fold improvements in specific detectivity (<i>D</i>), compared with those of SC counterparts. Notably, in the two-photon regime, <i>R</i> and EQE exhibit a 2–3-fold increase, and the On/Off ratio and <i>D</i> exhibit 12–16-fold improvements. The PCPM configuration enables the high-repetition-rate wafer-scale fabrication of active layers for imaging PDs and provides exceptional mechanical flexibility and self-recovery. These findings establish PCPMs as a scalable platform for next-generation perovskite wearable electronics.</p>

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Powder-polymer composite matrices for wafer-scale and flexible perovskite photodetectors

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Zhenyu Zhang,
  • Guoping Wang

摘要

Single-crystal (SC) structures have long been regarded as the optimal configuration for metal halide perovskite photodetectors (PDs); however, their applications in large-area imaging and wearable electronics face limitations due to size constraints and mechanical inflexibility. To address these challenges, this study develops a hybrid composite structure—polycrystalline powder (PCP) matrix (PCPM)—by strategically homogenizing 20 µm PCPs within a poly(methyl methacrylate) matrix. Such a configuration enables the formation of densely packed PCP microstructures while maintaining electric conductivity and mechanical flexibility. In the single-photon regime, responsivity (R) and external quantum efficiency (EQE) decline by 50%, with concurrent 3–4-fold enhancements in the On/Off ratio and 12–16-fold improvements in specific detectivity (D), compared with those of SC counterparts. Notably, in the two-photon regime, R and EQE exhibit a 2–3-fold increase, and the On/Off ratio and D exhibit 12–16-fold improvements. The PCPM configuration enables the high-repetition-rate wafer-scale fabrication of active layers for imaging PDs and provides exceptional mechanical flexibility and self-recovery. These findings establish PCPMs as a scalable platform for next-generation perovskite wearable electronics.