The surface plasmon resonances induced light coupling is widely recognized as a promising way of enhancing the light absorption in photovoltic devices. This is achieved by enhanced localized electromagnetic field in the vicinity of metal surface or the strong light scattering effects from metal nanoparticles integrated on the front surface of as-fabricated solar cells. In this paper, the colloidal gold nanoparticles(Au NPs), synthesized by modified Turkevich and Frens method, were integrated onto the inverted nanopyramid silicon solar cell via a dip coating method. A 7% increase in short-circuit current density of solar cell was observed for 15 minutes dip coating. As a result, a 4.6% increase in overall efficiency was achieved. However,the dense surface coverage of Au NPs resulted in decreased fill factor.
We are investigating the use of nanoscale imaging technologies that might help in the fundamental
understanding of cell function and lead to early diagnosis of diseases at a single cell and molecular level.
A new method has been developed that integrates nanoimprint lithography directly with biological materials to
create replica cell impressions in robust storage medium to facilitate topographical analysis using Atomic Force
Microscopy. Termed BioimprintTM, soft lithography techniques are used to transfer precise cell topography into
polymeric composite for imaging in harsh probing or electron beam environments. By creating a permanent biological
print that is captured in a specific moment of time, a recorded response of cellular events can be stored.
The high resolution transfer of this process is illustrated by imaging membrane morphological structures consist
with exocytosis, in pituitary cells. The integration of soft lithography and biological materials presents a novel method
for the study and detection of biological systems at the nano scale. Applications of this technique to cancer cells has also
A performance enhancement to planar lens lithography (PLL) through the use of i-line narrowband exposures has been investigated. Experimental results show that for a 50nm silver layer the image fidelity of narrowband exposures out performs broadband exposures. This is due to the removal of off-plasmonic-resonance wavelengths, which cause unwanted background exposure and a loss of image fidelity. Dense gratings have been resolved down to 145nm periods, as well as line-pairs down to separation distances of 117nm. These results out perform the diffraction-limits that restrict traditional optical-system resolution limits.
Conference Committee Involvement (4)
Biomedical Applications of Micro- and Nanoengineering IV
10 December 2008 | Melbourne, Australia
BioMEMS and Nanotechnology III
5 December 2007 | Canberra, ACT, Australia
Biomedical Applications of Micro- and Nanoengineering III