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Gold nanoparticles improve photodetector performance

Date:
July 26, 2013
Source:
American Institute of Physics (AIP)
Summary:
Using nanoparticles of gold, researchers have found a way to boost the performance of mineral molybdenum disulfide (MoS2), which is found in light-sensing photodetectors used in a wide range of technologies, such as environmental sensing, process control in factories, and optical communication devices.

The mineral molybdenum disulfide (MoS2), which, when solid, behaves in many ways like grease, has semiconducting properties that make it a promising alternative to silicon or graphene in electronic devices. It also strongly absorbs visible light, and so it has been widely employed in light-sensing photodetectors, which are used in a wide range of technologies, such as environmental sensing, process control in factories, and optical communication devices.

Researchers at the National University of Singapore have now found a way to boost the performance of MoS2 photodetectors even further -- with nanoparticles of gold. They describe this improvement in the journal Applied Physics Letters, which is produced by AIP Publishing.

Wei Chen, an assistant professor of chemistry and physics, along with graduate student Jia Dan Lin, and their colleagues, applied a single, loosely arranged layer of gold nanoparticles to the top of a MoS2 photodetector. The gold layer, although less than 15 billionths of a meter thick (representing the diameter of each individual nanoparticle) and made up of fewer than 1000 individual particles, improved the photodetectors' efficiency by a factor of three, according to Chen.

"We anticipate orders of magnitude higher improvement of MoS2's sensitivity using a higher density of coated nanoparticles," Chen said.

Chen suspects that the plasmon oscillations (variations in the electron density) of individual nanoparticles -- which enhance the local optical field -- may be one reason for the improved performance of the photodetectors.

"The next step will focus on varying the materials used to make the nanoparticles, as well as their size, shape, and arrangement," Chen noted -- adjustments that will "tune" the plasmon resonance wavelength of the metal nanostructure arrays, making it possible for MoS2 photodetectors todetect multiple colors for the first time.


Story Source:

The above story is based on materials provided by American Institute of Physics (AIP). Note: Materials may be edited for content and length.


Journal Reference:

  1. Jiadan Lin, Hai Li, Hua Zhang, Wei Chen. Plasmonic enhancement of photocurrent in MoS2 field-effect-transistor. Applied Physics Letters, 2013; 102 (20): 203109 DOI: 10.1063/1.4807658

Cite This Page:

American Institute of Physics (AIP). "Gold nanoparticles improve photodetector performance." ScienceDaily. ScienceDaily, 26 July 2013. <www.sciencedaily.com/releases/2013/07/130726103304.htm>.
American Institute of Physics (AIP). (2013, July 26). Gold nanoparticles improve photodetector performance. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2013/07/130726103304.htm
American Institute of Physics (AIP). "Gold nanoparticles improve photodetector performance." ScienceDaily. www.sciencedaily.com/releases/2013/07/130726103304.htm (accessed July 23, 2014).

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