The influence of doping on the device characteristics of In0.5Ga0.5As/GaAs/Al0.2Ga0.8As quantum dots-in-a-well infrared photodetectors
| Autor: | Chennupati Jagadish, Hark Hoe Tan, Gregory Jolley, Lan Fu |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Spectrophotometry Infrared business.industry Doping Photodetector Gallium Electron Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Indium Arsenicals Cold Temperature Responsivity Quantum dot Quantum Dots Optoelectronics General Materials Science business Quantum well Wetting layer Dark current |
| Zdroj: | Nanoscale. 2(7) |
| ISSN: | 2040-3372 |
| Popis: | We report on a detailed analysis of the effects of doping on the main device parameters of In(0.5)Ga(0.5)As/GaAs/Al(0.2)Ga(0.8)As quantum dots-in-a-well infrared photodetectors. Due to the relatively large conduction band offset of GaAs/Al(0.2)Ga(0.8)As (167 meV) transitions from wetting layer to quantum well states are observed for the highly doped devices. Since increasing the doping concentration fills the quantum dot states, electrons are forced to occupy the one-dimensional wetting layer states and therefore have quantum-well-like properties. This has facilitated a comparative study of the effects of three-dimensional and one-dimensional confinement of electrons on device parameters such as the responsivity and dark current by studying one particular detector structure with different doping concentrations of the active region. |
| Databáze: | OpenAIRE |
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