Hudanski Ludovic, Minoux Eric, Gangloff Laurent, Teo Kenneth B K, Schnell Jean-Philippe, Xavier Stephane, Robertson John, Milne William I, Pribat Didier, Legagneux Pierre
Nanocarb Laboratory, Thales-Ecole Polytechnique, Route Departementale 128, 91767 Palaiseau, France.
Nanotechnology. 2008 Mar 12;19(10):105201. doi: 10.1088/0957-4484/19/10/105201. Epub 2008 Feb 13.
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.
本文描述了一种新型光电阴极，它是垂直排列的多壁碳纳米管（MWCNT）阵列，每个MWCNT都与一个p-i-n光电二极管相连。与传统光电阴极不同，光子-电子转换功能和随后的电子发射在物理上是分离的。光子-电子转换由p-i-n光电二极管实现，电子从MWCNT发射。电流调制效率很高，因为它利用了MWCNT位置处电场的光控重新配置。这种器件与高频和非常大的带宽操作兼容，并可能导致它们应用于用于卫星通信的紧凑、轻便和高效的微波放大器。为了证明这种新的光电阴极概念，我们使用硅p-i-n光电二极管和MWCNT束制造了第一个基于碳纳米管的光电阴极。使用绿色激光，该光电阴极可提供0.5 mA的电流，内部量子效率为10%，I(ON)/I(OFF)比为30。
