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Laser Nanolithography Could Improve Nanomaterials

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Laser nanolithography shows potential for improving nanomaterials for electronic and optoelectronic components. Research teams at the National University of Singapore, led by professor Dr. Sow Chorng Haur, used similar techniques to alter the optical properties of a film of molybdenum disulfide (MoS2) and an array of mesoporous silicon nanowires.

Collaborating with researchers from Hong Kong Baptist University, one team generated greenish-blue photoluminescence by fast-scanning a focused green (532 nm) laser beam with power of 5 to 105 mW over a nanowire array.


Micropatterns etched in mesoporous silicon nanowire arrays were invisible under a bright-field optical microscope, as depicted by (a) and (c), but visible under fluorescence microscopy, as depicted by (b) and (d). Courtesy of the National University of Singapore.


The technique was also used to create micropatterns that were invisible under a bright-field optical microscope but visible under a fluorescence microscope.

Using an optical microscope-focused laser beam, the Singapore researchers created microdomains with well-defined structures and controlled thickness on a 2-D film of MoS2, a transition metal dichalcogenide compound. They said the process increased the film’s electrical conductivity by a factor of 10 and its photoconductivity by a factor of five, allowing them to create photodetectors with improved performance.

The approach is simple and low-cost, the researchers said, and its selectivity has advantages over other techniques that modify films in their entirety.

The work was published in ACS Nano (doi: 10.1021/nn501821z) and Scientific Reports (doi:10.1038/srep04940).

For more information, visit www.nus.edu.sg.
Meadowlark Optics - Building system MR 7/23

Published: July 2014
Glossary
nano
An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
optoelectronics
Optoelectronics is a branch of electronics that focuses on the study and application of devices and systems that use light and its interactions with different materials. The term "optoelectronics" is a combination of "optics" and "electronics," reflecting the interdisciplinary nature of this field. Optoelectronic devices convert electrical signals into optical signals or vice versa, making them crucial in various technologies. Some key components and applications of optoelectronics include: ...
photoconductivity
The conductivity increase exhibited by some nonmetallic materials, resulting from the free carriers generated when photon energy is absorbed in electronic transitions. The rate at which free carriers are generated, the mobility of the carriers, and the length of time they persist in conducting states (their lifetime) are some of the factors that determine the amount of conductivity change.
photoluminescence
The state of optically excited luminescence. Luminescence refers to the light emitted by excited atoms or ions as they decay to lower energy levels.
2DACS NanoAsia-Pacificconductivityfluorescence microscopeHong Kong Baptist UniversityImagingMaterialsMicroscopymolybdenum disulfideMoS2nanonanomaterialsnanowiresNational University of SingaporeOpticsoptoelectronicsphotoconductivityphotodetectorsphotoluminescenceResearch & TechnologyScientific ReportssiliconSingaporetransition metal dichalcogenideSow Chorng Haurfast scanningmesoporousmicropatternsbright-field optical microscopeLasers

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