High-Performance and Broadband Flexible Photodetectors Employing Multicomponent Alloyed 1D CdS x Se 1- x Micro-Nanostructures.

Low-cost multicomponent alloyed one-dimensional (1D) semiconductors exhibit broadband absorption from the ultraviolet to the near-infrared regime, which has attracted a great deal of interest in high-performance flexible optoelectronic devices. Here, we report the facile one-step fabrication of high-performance broadband rigid and flexible photodevices based on multicomponent alloyed 1D cadmium-sulfur-selenide (CdS x Se 1- x ) micro-nanostructures obtained via a vapor transport route. Photoresponse measurements have demonstrated their superior spectral photoresponsivity (5.8 × 10 4 A/W), several orders of magnitude higher than the pristine CdSe nanobelt photodevice, high specific detectivity (2 × 10 15 Jones), photogain (1.2 × 10 5 ), external quantum efficiency (EQE, 1.4 × 10 7 %), rapid response speed (13 ms), and excellent long-term environmental stability. The multicomponent alloyed CdS x Se 1- x nanobelt photodevice demonstrated about three times higher photocurrent as well as can operate under multiple color illuminations (200-800 nm) and at a high applied bias of 10 V with the photoresponsivity and EQE being boosted to 4.34 × 10 5 A/W and 8.96 × 10 7 %, respectively. Furthermore, multicomponent alloyed CdS x Se 1- x nanobelt flexible photodevices show excellent mechanical and flexural photostabilities with identical photoresponse as rigid nanodevices. The improvement mechanism found in the present research can be exploited to lead to the design of high-performance flexible photodevices comprising other multicomponent nanomaterials.