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Three kinds of devices based on single Er-doped CdSe nanobelt (Er-CdSe NB), single CdSe NB and four CdSe NBs in parallel were constructed by hard mask assisted with 10-μm tungsten wire in diameter. The photoelectronic properties of three kinds of devices were investigated. It is found that the dark currents of Er-CdSe NB and CdSe NB (four CdSe NBs in parallel) are 4 × 10−10 and 1.0 × 10−13 A (8.92 × 10−11 A). They have high Ion/Ioff ratios with 2.21 × 104 and 8.97 × 105 (4.61 × 104), respectively. The corresponding responsivity, external quantum efficiency and detectivity of Er-CdSe NB and CdSe NB (four CdSe NBs in parallel) are 2.17 × 103, 3.87 × 105 and 2.27 × 1012 A/W; 3.84, 692 and 2.9 × 1011; 1.59 × 102, 2.86 × 104 and 4.96 × 1011 Jones. The responsivity Rλ and external quantum η of four CdSe NBs in parallel are higher by two orders of magnitude than that of single CdSe NB device. The detectivity D* of the former is twofold higher than that of the latter. In the meantime, Rλ, η and D* of Er-CdSe NB are 10-fold higher than those of four CdSe NBs in parallel. The superior performance of the Er-CdS NB device offers an avenue to develop highly sensitive photodetector applications. [ABSTRACT FROM AUTHOR]

Pure SnO and Y-doped SnO nanobelts were prepared by thermal evaporation at 1350 °C in the presence of Ar carrier gas (30 sccm). The samples were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), energy dispersion spectrometer (EDS), X-ray photoelectron spectrometer (XPS), UV-Vis absorption spectroscopy, Raman spectroscopy, and Fourier transform infrared spectrum (FTIR). The sensing properties of the devices based on a single SnO nanobelt and Y-doped SnO nanobelt were explored to acetone, ethanol, and ethanediol. It reveals that the sensitivity of single Y-doped SnO nanobelt device is 11.4 to 100 ppm of acetone at 210 °C, which is the highest response among the three tested VOC gases. Y ions improve the sensitivity of SnO sensor and have an influence on the optical properties of Y-doped SnO nanobelts. [ABSTRACT FROM AUTHOR]