期刊
ACS PHOTONICS
卷 9, 期 3, 页码 868-872出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.1c01551
关键词
graphene; optical absorption; optoelectronic devices; III-V semiconductors; refractive index; CVD
类别
资金
- project TEFLON-CM - Regional Government of Madrid (Comunidad de Madrid) [Y2018/EMT-4892]
- ERDF Funds
- AEI [EQC2019-005701-P]
- MCIN
- ERDF A way to make Europe
This paper investigates the absorption characteristics of graphene on different thicknesses of AIInP layers. The results show that the absorption decreases with the number of graphene layers, which can be utilized for more efficient design of optoelectronic devices.
Graphene absorption has a widely accepted theoretical value of 2.3% for a freestanding single layer in a wide spectral range that covers the visible spectrum. This value is also oftentimes assumed when graphene films are part of more complex structures. However, the absorption of graphene depends on the refractive indices and thicknesses of the adjacent media. In this paper, we have determined the absorption of graphene for a wide range of thicknesses of AIInP layers (a typical III-V semiconductor used in optoelectronic devices) as an example of the surrounding medium and as a function of the number of graphene layers. The resulting absorption minima within the spectrum range from 400 to 900 nm are 0.9, 2.0, and 3.0% for one, two, and three monolayers of graphene, respectively, on a 30 nm thick AIInP layer. This decrease of graphene absorption with regard to the nominal value of 2.3% can be used in the quest of a more effective design for optoelectronic devices.
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