HfX3(X = Se and S)/graphene composites for flexible photodetectors from visible to near-infrared

Abstract Flexible photodetectors from 405 to 980 nm based on HfSe 3 or HfS 3 nanobelts (NBs)/graphene composites were fabricated on polypropylene (PP) films. Compared with HfSe 3 or HfS 3 NB photodetectors, the flexible composite photodetector showed enhancement of photoresponsivity. For substance, under the illumination light of 405 nm (14.4 mW/cm 2 ), the responsivities of HfSe 3 NBs, HfSe 3 NBs/GO (graphene oxide) and HfSe 3 NBs/RGO (reduced graphene oxide) photodetectors were 1.1 × 10 −4 , 4.3 × 10 −3 and 0.5 (mA/W), respectively, while those of HfS 3 NBs, HfS 3 NBs/GO and HfS 3 NBs/RGO photodetectors were 0.11, 0.92 and 0.55 (mA/W), respectively. Meanwhile, these photodetectors exhibited excellent durability and stability after they were placed for 3 months and bended 500 times. So the composites are promising optoelectronic materials, and the flexible photodetectors are high-performance photodetectors from visible to near-infrared.