Carbon nanotube based photocathodes
| Autor: | Kenneth B. K. Teo, Eric Minoux, Pierre Legagneux, Stéphane Xavier, Laurent Gangloff, John Robertson, William I. Milne, Didier Pribat, Ludovic Hudanski, Jean-Philippe Schnell |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Silicon Physics::Instrumentation and Detectors business.industry Mechanical Engineering chemistry.chemical_element Bioengineering General Chemistry Carbon nanotube Electron Photocathode law.invention Photodiode Bunches chemistry Mechanics of Materials law Electric field Optoelectronics General Materials Science Quantum efficiency Electrical and Electronic Engineering business |
| Zdroj: | Nanotechnology. 19(10) |
| ISSN: | 0957-4484 |
| Popis: | This paper describes a novel photocathode which is an array of vertically aligned multi-walled carbon nanotubes (MWCNTs), each MWCNT being associated with one p-i-n photodiode. Unlike conventional photocathodes, the functions of photon-electron conversion and subsequent electron emission are physically separated. Photon-electron conversion is achieved with p-i-n photodiodes and the electron emission occurs from the MWCNTs. The current modulation is highly efficient as it uses an optically controlled reconfiguration of the electric field at the MWCNT locations. Such devices are compatible with high frequency and very large bandwidth operation and could lead to their application in compact, light and efficient microwave amplifiers for satellite telecommunication. To demonstrate this new photocathode concept, we have fabricated the first carbon nanotube based photocathode using silicon p-i-n photodiodes and MWCNT bunches. Using a green laser, this photocathode delivers 0.5 mA with an internal quantum efficiency of 10% and an I(ON)/I(OFF) ratio of 30. |
| Databáze: | OpenAIRE |
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