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Toward Metal-organic Insulator-semiconductor Solar Cells, Based On Molecular Monolayer Self-assembly On N-Si

Rotem Har-lavan, Izhar Ron, F. Thieblemont, D. Cahen
Published 2009 · Chemistry

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Alkyl chain molecules on n-Si were used to test the concept of hybrid metal-organic insulator-semiconductor (MOIS) solar cells. Test structures were made by binding alkyl chain molecules via Si–O–C bonds to oxide-free n-Si surfaces, using self-assembly. With thiol groups at the terminals away from the Si, binding of Au nanoparticles, followed by electroless Au plating yields semitransparent top contacts. First cells give, under 25 mW/cm2 white light illumination, open-circuit voltage Voc=0.48 V and fill factor FF=0.58. Because with sulfur termination the molecules have a dipole that limits inversion of the Si, we also used methyl-terminated monolayers. Even though then we can work, at this point, only with a Hg top contact, without chemical bond to the molecules, we get, using only radiation (∼AM 1.5) collected around the contact, the expected higher Voc=0.54 V, and respectable 0.8 FF, justifying further MOIS cell development.Alkyl chain molecules on n-Si were used to test the concept of hybrid metal-organic insulator-semiconductor (MOIS) solar cells. Test structures were made by binding alkyl chain molecules via Si–O–C bonds to oxide-free n-Si surfaces, using self-assembly. With thiol groups at the terminals away from the Si, binding of Au nanoparticles, followed by electroless Au plating yields semitransparent top contacts. First cells give, under 25 mW/cm2 white light illumination, open-circuit voltage Voc=0.48 V and fill factor FF=0.58. Because with sulfur termination the molecules have a dipole that limits inversion of the Si, we also used methyl-terminated monolayers. Even though then we can work, at this point, only with a Hg top contact, without chemical bond to the molecules, we get, using only radiation (∼AM 1.5) collected around the contact, the expected higher Voc=0.54 V, and respectable 0.8 FF, justifying further MOIS cell development.
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