The Study of Porphyrins Confinement in Nafion Membrane and Photovoltaic Properties of a Bulk Heterojunction Solar Cell
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Date
2007-03
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Addis Ababa University
Abstract
With the development of strong laser sources for different applications which in some
instances has extremely high intensity, optical power limiters are needed to provide
human eye and optical detector protection. So, a smart ultra fast optical power limiter
that is transparent for low incident intensities and blocks the output at high input
intensities is required. The operation of optical power limiters is based on the phenomena
of nonlinear absorption (NLA). Different Porphyrins have been reported to
have NLA property which put them as potential candidate for application as optical
power limiters. In this paper, we have investigated NLA and optical limiting properties
of five different types of Porphyrins by using the Z-scanning technique. The
Porphyrins were confined into Nafion membrane in order to protect them from possible
degradation. The results of the experiments clearly show the fascinating NLA
and optical power limiting properties of the Porphyrins under investigation. By fitting
the Z-scan results with the theoretical fitting function, the nonlinear absorption
coefficients (¯) of all the Porphyrins with different concentrations for each of them is
determined. Besides, their linear absorption coefficients are obtained by considering
low intensity regimes from the data and applying Beer’s low of linear absorption
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The Study of Porphyrins Confinement