Cation-exchange synthesis of PbSe/ZnSe hetero-nanobelts with enhanced near-infrared photoelectronic performance
| Autor: | Kai-Ge Zheng, Ping Kang, Zheng Guo, Zhuo Wang, Li Chen |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Mechanical Engineering Near-infrared spectroscopy Nanoparticle Bioengineering 02 engineering and technology General Chemistry Thermal treatment 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Spectral line 0104 chemical sciences Crystal Wavelength Semiconductor Mechanics of Materials Optoelectronics General Materials Science Electrical and Electronic Engineering 0210 nano-technology Absorption (electromagnetic radiation) business |
| Zdroj: | Nanotechnology. 32:335504 |
| ISSN: | 1361-6528 0957-4484 |
| DOI: | 10.1088/1361-6528/ac0192 |
| Popis: | To develop excellent photoelectronic and photovoltaic devices, a semiconductor with high photoelectron production efficiency and broad band absorption is urgently required. In this article, novel II-type PbSe/ZnSe hetero-nanobelts with enhanced near-infrared absorption have been synthesized via a facile strategy of a partial cation-exchange reaction and thermal treatment. Derived from ZnSe·0.5N2H4 nanobelts as templates, the belt-like morphology was preserved. Due to the mismatch of the crystal type and parameters between PbSe and ZnSe, the formed PbSe in the form of nanoparticles were separated out and decorated on the nanobelts. Furthermore, the composition ratio of Pb/Zn can be tuned through manipulating the adding amount of Pb2+ cations, the reaction temperature and time. The ultraviolet−visible−infrared diffuse spectra measurements suggest that the as-prepared PbSe/ZnSe hetero-nanobelts exhibited a broad band absorption from 300 to 1000 nm. In addition, they demonstrated excellent photoresponsivity in the same wavelength region and displayed a peak at approximately 840 nm. Finally, the enhanced photoelectronic sensing mechanism was discussed. |
| Databáze: | OpenAIRE |
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