SnSe(2) Quantum Dots: Facile Fabrication and Application in Highly Responsive UV-Detectors

Synthesizing quantum dots (QDs) using simple methods and utilizing them in optoelectronic devices are active areas of research. In this paper, we fabricated SnSe(2) QDs via sonication and a laser ablation process. Deionized water was used as a solvent, and there were no organic chemicals introduced in the process. It was a facile and environmentally-friendly method. We demonstrated an ultraviolet (UV)-detector based on monolayer graphene and SnSe(2) QDs. The photoresponsivity of the detector was up to 7.5 × 10(6) mAW(−1), and the photoresponse time was ~0.31 s. The n–n heterostructures between monolayer graphene and SnSe(2) QDs improved the light absorption and the transportation of photocarriers, which could greatly increase the photoresponsivity of the device.