Quantum Dots for the Enhancement of Optoelectronic Devices
Principal Investigator: Lih-Yuan Lin
Optoelectronic devices, including photodetectors and photovoltaics, are becoming ubiquitous technologies. Devices which use optoelectronic systems are prevalent in mobile devices as well as a variety of research tools and other systems. Improvements to optoelectronic devices focus on more efficient and smaller systems, with a goal of detecting a particular wavelength of light with less energy. Recent advances have suggested that quantum dots may improve the efficiency and selectivity of optoelectronic devices, but quantum dot technology has not been widely implemented into devices. One of the reasons for the lack of quantum dot devices is due to the fact that positioning quantum dots in between electrodes has been time consuming and proble
This invention is for a new optoelectronic device which makes use of a self-assembled monolayer of quantum dots positioned on a semiconductor layer which spans the gap between two electrodes. The novel optoelectronic device is capable of increasing the ability of photodetectors to detect a smaller range of wavelengths with greater sensitivity. This technology can also enhance the efficiency of photovoltaic devices. Quantum dots, or plasmonic nanoparticles, are placed on a substrate using an adhesive layer attached to a semiconductor, resulting in a monolayer of particles. The resulting system has a photoconductive response which can be tuned to respond for a wavelength of interest by changing the material of the quantum dots and the thickness of the quantum dot layer.
• Quantum dot monolayers may be used in photodetectors to decrease sensor size or increase selectivity.
• This device may be used in photovoltaic cells to enhance efficiency and power conversion.
• Optical sensors can use quantum dots to enhance performance.
• Self-assembled monolayers of quantum dots eliminate the need for discrete positioning.
• This device is more efficient than current devices without quantum dots.
• Optoelectronic devices can be tuned to be more sensitive to light from a range of wavelengths of interest.
For more info, contact: Ryan Buckmaster
- Ludan Huang, Chang-Ching Tu, Lih Y. Lin (March 16, 2011), Colloidal quantum dot photodetectors enhanced by self-assembled plasmonic nanoparticles, Applied Physics Letters
- Michael C. Hegg, Matthew P. Horning, Tom Baehr-Jones, Michael Hochberg, Lih Y. Lin (March 12, 2010), Nanogap quantum dot photodetectors with high sensitivity and bandwidth, Applied Physics Letters
- M. Hegg, L. Y. Lin , Near-field photodetection with high spatial resolution by nanocrystal quantum dots
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