The Study Of Porphyrins Confinement In Nafion Membrane And Photovoltaic Properties Of A Bulk Heterojunction Solar Cell

With the development of strong laser sources for different applications which in somerninstances has extremely high intensity, optical power limiters are needed to providernhuman eye and optical detector protection. So, a smart ultra fast optical power limiterrnthat is transparent for low incident intensities and blocks the output at high inputrnintensities is required. The operation of optical power limiters is based on the phenomenarnof nonlinear absorption (NLA). Different Porphyrins have been reported tornhave NLA property which put them as potential candidate for application as opticalrnpower limiters. In this paper, we have investigated NLA and optical limiting propertiesrnof five different types of Porphyrins by using the Z-scanning technique. ThernPorphyrins were confined into Nafion membrane in order to protect them from possiblerndegradation. The results of the experiments clearly show the fascinating NLArnand optical power limiting properties of the Porphyrins under investigation. By fittingrnthe Z-scan results with the theoretical fitting function, the nonlinear absorptionrncoefficients (¯) of all the Porphyrins with different concentrations for each of them isrndetermined. Besides, their linear absorption coefficients are obtained by consideringrnlow intensity regimes from the data and applying Beer’s low of linear absorption

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