TITLE

Toward metal-organic insulator-semiconductor solar cells, based on molecular monolayer self-assembly on n-Si

AUTHOR(S)
Har-Lavan, Rotem; Ron, Izhar; Thieblemont, Florent; Cahen, David
PUB. DATE
January 2009
SOURCE
Applied Physics Letters;1/26/2009, Vol. 94 Issue 4, pN.PAG
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
36434988

 

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