Highly-Responsive Broadband Photodetector Based on Graphene-PTAA-SnS₂ Hybrid

The development of wearable systems stimulate the exploration of flexible broadband photodetectors with high responsivity and stability. In this paper, we propose a facile liquid-exfoliating method to prepare SnS₂ nanosheets with high-quality crystalline structure and optoelectronic properties. A flexible photodetector is fabricated using the SnS₂ nanosheets with graphene-poly[bis(4-phenyl) (2,4,6-trimethylphenyl) amine (PTAA) hybrid structure. The liquid-exfoliated SnS₂ nanosheets enable the photodetection from ultraviolet to near infrared with high responsivity and detectivity. The flexible broadband photodetector demonstrates a maximum responsivity of 1 × 10⁵ A/W, 3.9 × 10⁴ A/W, 8.6 × 10² A/W and 18.4 A/W under 360 nm, 405 nm, 532 nm, and 785 nm illuminations, with specific detectivity up to ~10¹² Jones, ~10¹¹ Jones, ~10⁹ Jones, and ~10⁸ Jones, respectively. Furthermore, the flexible photodetector exhibits nearly invariable performance over 3000 bending cycles, rendering great potentials for wearable applications.