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 x 10(5) A/W, 3.9 x 10(4) A/W, 8.6 x 10(2) A/W and 18.4 A/W under 360 nm, 405 nm, 532 nm, and 785 nm illuminations, with specific detectivity up to similar to 10(12) Jones, similar to 10(11) Jones, similar to 10(9) Jones, and similar to 10(8) Jones, respectively. Furthermore, the flexible photodetector exhibits nearly invariable performance over 3000 bending cycles, rendering great potentials for wearable applications.

Automated summary

This paper proposes a facile liquid-exfoliating method to prepare high-quality SnS2 nanosheets and fabricates a flexible photodetector using the SnS2 nanosheets with a graphene-PTAA hybrid structure. The photodetector shows high responsivity and detectivity from ultraviolet to near infrared. Furthermore, the flexible photodetector exhibits nearly invariable performance over bending cycles, making it suitable for wearable applications.