Layer-Dependent Properties of Ultrathin GeS Nanosheets and Application in UV–Vis Photodetectors
| Autor: | Yu Li, Junqin Li, Fusheng Liu, Feng Zhang, Xing Fan, Heping Xie, Liumei Su, Dazhou Huang, Han Zhang, David K. Sang, Yuejia Chen |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
business.industry Photodetector chemistry.chemical_element Germanium 02 engineering and technology Photodetection Photoelectric effect 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Exfoliation joint 0104 chemical sciences Phosphorene chemistry.chemical_compound chemistry Optoelectronics General Materials Science Thin film 0210 nano-technology Electronic band structure business |
| Zdroj: | ACS Applied Materials & Interfaces. 11:47197-47206 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | Two-dimensional germanium sulfide (GeS), an analogue of phosphorene, has attracted broad attention owing to its excellent environmental stabilities, fascinating electronic and optical properties, and applications in various nanodevices. In spite of the current achievements on 2D GeS, the report of ultrathin few-layer GeS nanosheets within 5 nm is still lacking. Here in this contribution, we have achieved preparation of ultrathin few-layer GeS nanosheets with thicknesses of 1.3 ± 0.1 nm [approximately three layers (∼3L)], 3.2 ± 0.2 nm (∼6L), and 4.2 ± 0.3 nm (∼8L) via a typical liquid-phase exfoliation (LPE) method. Based on various experimental characterizations and first-principles calculations, the layer-dependent electronic, transport, and optical properties are investigated. For the few-layer GeS nanosheets, enhanced light absorption in the UV-vis region and superior photoresponse behavior with increasing layer number is observed, while for the thin films above 10 nm, the properties degenerate to the bulk feature. In addition, the as-prepared ultrathin nanosheets manifest great potential in the applications of photoelectrochemical (PEC)-type photodetectors, exhibiting excellent and stable periodic photoresponse behavior under the radiation of white light. The ∼8L GeS-based photodetector exhibits superior performance than the thinner GeS nanosheets ( |
| Databáze: | OpenAIRE |
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