Hot Injection-Based Synthesized Colloidal CdSe Quantum Dots Embedded in Poly(4-vinylpyridine) (PVP) Matrix Form a Nanoscale Heterostructure for a High On–Off Ratio Memory-Switching Device
| Autor: | Parveen Dagar, Atanu Betal, Satyajit Sahu, Rakesh Rosan Pradhan, Jayanta Bera |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Chalcogenide Heterojunction 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 010402 general chemistry 021001 nanoscience & nanotechnology Thermal conduction 01 natural sciences Space charge 0104 chemical sciences chemistry.chemical_compound Colloid chemistry Quantum dot Thermal Optoelectronics General Materials Science 0210 nano-technology business Nanoscopic scale |
| Zdroj: | ACS Applied Materials & Interfaces. 13:25064-25071 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.1c02702 |
| Popis: | Chalcogenide-based quantum dots are useful for the application of memory-switching devices because of the control in the trap states in the materials. The control in the trap states can be achieved using a hot-injection colloidal synthesis method that produces temperature-dependent size-variable quantum dots. In addition to this, formation of a nanoscale heterostructure with an insulating material adds to the charge-trapped switching mechanism. Here, we have shown that the colloidal monodispersed CdSe quantum dots and poly(4-vinylpyridine) (PVP) formed a nanoscale heterostructure between themselves when taken in a suitable ratio to fabricate a device. This heterostructure helps realize memory-switching in the device with a maximum on-off current ratio of 105. The switching in the device is mainly due to the trap states in the CdSe quantum dots. The conduction in the off state is due to thermal charge injection and space charge injection conduction and in the on state, due to the Ohmic conduction mechanism. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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