Photodetectors Based on 2D Materials
- Photonic and Optoelectronic Applications of 2D Materials
- Photodetectors Based on 2D Materials
Photodetectors are light-sensing devices that transform light into electric current. They are found in a wide range of gadgets in our daily lives. Two-dimensional (2D) graphene has numerous excellent qualities, including being ultra-thin, lightweight, flexible, and easy to construct vertical heterojunctions using van der Waals forces. It is also compatible with traditional microfabrication processes and has programmable energy bands. This makes it a promising candidate for photodetectors to replace conventional materials that do not meet the growing needs of high-frequency communications, national security, new biomedical imaging, and many other fields. Alfa Chemistry can provide unique 2D material solutions that meet customer needs. Please contact us today so we can assist you with your photodetector application research.
Commercially available detectors have a number of drawbacks, including:
(1) low operating temperatures for terahertz and infrared detection.
(2) low operating frequencies.
(3) complex manufacturing processes.
In a novel class of materials utilized for optoelectronic applications, 2D materials have exhibited good characteristics. Interesting aspects include direct properties and a wide variety of band gaps, atomically thin properties, effective light-matter interactions, and heterogeneous structure development.
Fig 1. Photodetector based on MoTe2/graphene heterostructure. (Yu W, et al. 2017)
Several strategies have been shown to be effective in improving the performance of photodetectors based on two-dimensional materials. Typical strategies include the following.
(1) Device design, including configuration and electrode materials.
(2) Integration with optical structures such as antennas, microcavities, and gratings to enhance the interaction of light with 2D materials.
(3) Integration with strong light-absorbing materials such as QDs or SWCNTs.
(4) Engineering of energy band structures by shearing graphene into quantum dot arrays (GQD) or nanoribbons.
(5) Excitation of plasmon resonance in 2D materials, etc.
Alfa Chemistry is a leader in the field of 2D materials research, and we provide a wide selection of 2D materials and unique services to help you with your photodetector research. The following are some of the 2D materials we can provide that are suitable for photonics applications:
Fig 2. Model of Si/MoS2 heterostructure based photodetector. (Kharadi M. A, et al. 2020)
|Type||Active Materials||Response Spectrum||Responsivity|
|UV||Few-layer BP||310 nm ~ 400 nm||90000 A/W|
|GQD||254 nm||2.1 mA/W|
|GaS||254 nm||19.2 A/W|
|WS2 (CVD)||365 nm||53.3 A/W|
|Vis-NIR||Single-layer-MoS2||400 nm ~ 600 nm||880 A/W|
|Multilayer MoSe2||638 nm||93.7 A/W|
|Few-layer ReS2||532 nm||88600 A/W|
|MoS2/graphene/WSe2||400 nm ~ 2400 nm||04 A/W (Vis)|
|MIR-FIR||GNR(Passivated by HfO2)||10 μm||0.18 A/W|
|Thermal reduced GO||3 μm ~ 25 μm||9 mA/W|
|BP||400 nm ~ 3750 nm||–|
|THz||MLG||2 THz ~ 3 THz||230 A/W|
|Gra-hBN-Gra||0.1 THz ~ 2.5 THz||32 A/W|
|h-BN/few layer BP/h-BN||–||1.7 V/W|
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