Efficient light harvesting with LB films for application in crystalline silicon solar cells
Danos, L and Markvart, T (2009) Efficient light harvesting with LB films for application in crystalline silicon solar cells. In, Energy Harvesting—Molecules and Materials. 5th Photovoltaic Science, Applications and Technology Warrendale, USA, Materials Research Society, 1-4. (MRS Proceedings, 1120 M). (doi:10.1557/PROC-1120-M01-04).
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Description/Abstract
We have carried out fluorescence lifetime measurements using time correlated single
photon counting (TCSPC) for a cyanine dye near the silicon surface. The measurements have
been carried out for both (100) and (111) crystal orientations of the silicon surface, showing the
dependence of energy transfer rate as a function of the separation between the dye monolayer
and the silicon surface. Langmuir Blodgett fatty acid layers were used to create a multistep
structure and a monolayer of a cyanine dye was deposited on top of the stepped structure.
Spectroscopic ellipsometry has been used to measure the thickness of the fatty acid steps and
provide an accurate estimate of the distance of the dye monolayer to the silicon surface. Time
resolved emission spectra and fluorescence decay curves were measured with a single photon
picosecond time correlated system. We find that the fluorescence lifetime of the dye monolayer
is significantly shortened when present close to the silicon surface signifying efficient energy
transfer. The dissipation of the excitation energy near silicon is explained using the classical
theory developed for metals and a deviation is observed for distances close to the silicon surface
(d<5nm). The model can be reconciled with the observed data by modifying the value of the
silicon extinction coefficient which can provide an insight into the energy transfer process in the
near field dye-silicon interaction
| Item Type: | Book Section |
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| Related URLs: | |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering |
| Item ID: | 68603 |
| Date Deposited: | 11 Dec 2009 |
| Last Modified: | 02 Mar 2012 12:52 |
| Contributors: | Danos, L (Author) Markvart, T (Author) |
| Date: | 2009 |
| Status: | Published |
| Publisher: | Materials Research Society |
| URI: | http://eprints.soton.ac.uk/id/eprint/68603 |
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