Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3076115
Keywords
bonds (chemical); electroplating; MIS devices; molecular electronics; monolayers; nanoparticles; self-assembly; solar cells
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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/cm(2) white light illumination, open-circuit voltage V-oc=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 (similar to AM 1.5) collected around the contact, the expected higher V-oc=0.54 V, and respectable 0.8 FF, justifying further MOIS cell development.
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