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Carbon nanotube based photocathodes

机译：碳纳米管基光电阴极

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摘要

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.
机译：本文介绍了一种新颖的光电阴极，它是垂直排列的多壁碳纳米管（MWCNT）的阵列，每个MWCNT与一个p-i-n光电二极管相关。与常规的光电阴极不同，光子-电子转换和随后的电子发射的功能在物理上是分开的。通过p-i-n光电二极管实现光子-电子转换，并且电子发射从MWCNT发生。电流调制非常有效，因为它在MWCNT位置使用电场的光学控制重新配置。这样的设备与高频和非常大的带宽操作兼容，并且可能导致它们在紧凑，轻便和高效的卫星通信微波放大器中的应用。为了演示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束制造了首个基于碳纳米管的光电阴极。使用绿色激光，此光电阴极可提供0.5 mA的电流，内部量子效率为10％，I-ON / I-OFF比率为30。

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