CdSSe nanobelts (NBs) are synthesized by thermal evaporation and then characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), and cathodoluminescence (CL). It is found that the CdSSe NBs have a good morphology and microstructure without defects. CL is sensitive to the defects of CdSSe NBs; thus, we can select single nanobelt with homogeneous CL emission to prepare a detector. Based on it, the photodetector of single CdSSe NB was developed and its photoelectric properties were investigated in detail. It is found that under illumination of white light and at the bias voltage of 1 V, the photocurrent of a single CdSSe nanobelt device is 1.60 × 10−7 A, the dark current is 1.96 × 10−10 A, and the ratio of light current to dark one is 816. In addition, the CdSSe nanobelt detector has high photoelectric performance with spectral responsivity of 10.4 AW−1 and external quantum efficiency (EQE) of 19.1%. Its rise/decay time is about 1.62/4.70 ms. This work offers a novel strategy for design wavelength-controlled photodetectors by adjusting their compositions.

All‐inorganic perovskite CsPbBr ₃ is considered as a promising photoelectric material due to its high environmental stability and excellent photoelectric properties. Constructing low‐dimension hybrid structures by combining CsPbBr ₃ with semiconductor materials have recently attracted particular attention because they may bring new functionalities or generate synergistic effects in optoelectronic devices. Herein, the high‐quality 1D CdSe nanobelt (NB)/CsPbBr ₃ microwire (MW) photodetectors are designed first time, which exhibit excellent performance as integrating I _on / I _off ratio of 5.02 × 10 ⁴ , responsivity of 1.63 × 10 ³ A/W, external quantum efficiency of 3.8 × 10 ⁵ % and detectivity up to 5.33 × 10 ¹² Jones. These properties are all improved at least one order of magnitude compared to those of single CsPbBr ₃ photodetectors. Moreover, the response range is broadened from the 300–570 nm (the single CsPbBr ₃ device) to 300–740 nm (the hybrid photodetector). Then, the first‐principles calculations are carried out to reveal the physical mechanism from the atomic scale. The remarkably improved optoelectronic properties are attributed to the high crystalline quality as well as unique band alignment of hybrid structure that facilitate the effective separation and transport of photogenerated carriers. These works indicate that 1D CdSe/CsPbBr ₃ hybrid devices have promising applications in building high‐performance and broader spectral response photodetectors and other optoelectronic devices.

Layered Bi₂O₂Se nanosheets, characterized by a low bandgap, high electron mobility, and good air stability, have garnered significant attention for their potential applications in electronics and photonics. However, the relatively low photocurrent generated by single Bi₂O₂Se nanosheet photodetectors results in diminished switching ratios and responsiveness, thereby limiting the overall performance of Bi₂O₂Se-based photodetectors. In this study, we report a dual-band heterostructure photodetector constructed from high-quality Bi₂O₂Se nanosheets and CdS nanobelts. This device demonstrates exceptional photodetection performance in both the visible (450 nm) and near-infrared (1150 nm) regions, featuring a high switching ratio, increased responsivity, elevated specific detectivity, large external quantum efficiency, and rapid response speed. Notably, these key parameters exceed those reported in most Bi₂O₂Se-based photodetectors. Importantly, the Bi₂O₂Se/CdS heterostructure photodetector showcases impressive high-resolution imaging capabilities. These findings highlight the promising potential of this device for applications in image sensing and encrypted optical communication.

With the continuous improvement in material life, people are paying more and more attention to air quality; therefore, it is critical to design efficient and stable gas sensor devices. In this work, a flowery WSe₂ nanostructure and its nanocomposite (Au@WSe₂) decorated with Au nanoparticles were fabricated by the hydrothermal method. The performance of a resistive sensor with flowery WSe₂ and Au@WSe₂ sensors was evaluated by detecting volatile organic compounds such as ethanol, isoamylol, n-butyl alcohol, isopropanol, isobutanol and n-propanol. The results show that Au-nanoparticle-decorated flowery WSe₂ can decrease the optimal working temperature from 215 °C to 205 °C and significantly enhance the response of flowery WSe₂. The response values to isoamylol are the highest (as high as 44.5) at a low gas concentration (100 ppm), while the response values to ethanol are the highest (as high as 178.5) at a high gas concentration (1000 ppm) among the six different alcohols. Moreover, the response is steady and repeatable. The results demonstrate that the Au@WSe₂ substrate has good responsiveness and selectivity, which makes it a promising candidate for gas detection.