Graphene-Antenna Sandwich Photodetector
详细信息 查看全文
- 作者：Zheyu Fang ; Zheng Liu ; Yumin Wang ; Pulickel M. Ajayan ; Peter Nordlander ; Naomi J. Halas
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：July 11, 2012
- 年：2012
- 卷：12
- 期：7
- 页码：3808-3813
- 全文大小：359K
- 年卷期：v.12,no.7(July 11, 2012)
- ISSN：1530-6992
文摘
Nanoscale antennas sandwiched between two graphene monolayers yield a photodetector that efficiently converts visible and near-infrared photons into electrons with an 800% enhancement of the photocurrent relative to the antennaless graphene device. The antenna contributes to the photocurrent in two ways: by the transfer of hot electrons generated in the antenna structure upon plasmon decay, as well as by direct plasmon-enhanced excitation of intrinsic graphene electrons due to the antenna near field. This results in a graphene-based photodetector achieving up to 20% internal quantum efficiency in the visible and near-infrared regions of the spectrum. This device can serve as a model for merging the light-harvesting characteristics of optical frequency antennas with the highly attractive transport properties of graphene in new optoelectronic devices.