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<p>The demand for sustainable, flexible, and wearable optoelectronic technologies has intensified the search for environmentally benign materials and substrates. In this work, we demonstrate a lead-free photodetector based on Cs<sub>2</sub>AgBiBr<sub>6</sub> nanocrystals (CABB NCs) integrated with MoS₂ nanoflowers to form a hybrid heterostructure on biodegradable cellulose paper. The optimized CABB/MoS<sub>2</sub> composite delivers more than an order-of-magnitude enhancement in photocurrent compared to pristine CABB, along with fast response and recovery times and excellent operational stability under repeated illumination cycles. Under solar illumination, the device achieves a responsivity of 60&#xa0;mA&#xa0;W⁻<sup>1</sup> and a detectivity of 1.64 × 10<sup>11</sup> Jones. Structural and optical analyses reveal a Type-II band alignment that promotes efficient charge separation, supported by significant PL quenching and a reduction in carrier lifetime from 3.31&#xa0;ns to 1.36&#xa0;ns. XRD and TEM results further confirm the formation of well-coupled heterostructures with strong interfacial contact and improved light absorption. The use of cellulose paper as a substrate not only minimizes environmental impact but also enables the development of lightweight, low cost, and wearable photodetectors. Overall, this study highlights the potential of CABB/MoS<sub>2</sub> hybrid structures as a promising platform for sustainable and eco-friendly photodetection.</p>

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Lead-free Cs2AgBiBr6–MoS2 hybrid heterostructures for eco-friendly and efficient photodetection on paper substrates

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Kalyanee Patil,
  • Rucha Lambate,
  • Kavita Mukate,
  • Tejashree Bhave

摘要

The demand for sustainable, flexible, and wearable optoelectronic technologies has intensified the search for environmentally benign materials and substrates. In this work, we demonstrate a lead-free photodetector based on Cs2AgBiBr6 nanocrystals (CABB NCs) integrated with MoS₂ nanoflowers to form a hybrid heterostructure on biodegradable cellulose paper. The optimized CABB/MoS2 composite delivers more than an order-of-magnitude enhancement in photocurrent compared to pristine CABB, along with fast response and recovery times and excellent operational stability under repeated illumination cycles. Under solar illumination, the device achieves a responsivity of 60 mA W⁻1 and a detectivity of 1.64 × 1011 Jones. Structural and optical analyses reveal a Type-II band alignment that promotes efficient charge separation, supported by significant PL quenching and a reduction in carrier lifetime from 3.31 ns to 1.36 ns. XRD and TEM results further confirm the formation of well-coupled heterostructures with strong interfacial contact and improved light absorption. The use of cellulose paper as a substrate not only minimizes environmental impact but also enables the development of lightweight, low cost, and wearable photodetectors. Overall, this study highlights the potential of CABB/MoS2 hybrid structures as a promising platform for sustainable and eco-friendly photodetection.