Publication date: 15th December 2014
Fullerenes have found their main application in organic photovoltaic devices.[1],[2] Their ability to give rise a high efficient photo-induced electron transfer process and their behaviour as n-type charge carriers have made them suitable organic acceptors in polymeric solar cells along with donor polymers.[3]
The chemical functionalization of these all-carbon cages has been significantly improved and nowadays a wide range of synthetic tools are available to prepare fullerene derivatives with a high control on their optoelectronic proprieties.
In this communication, we report our recent strategies to prepare fullerenes-based n-type materials with potential application, beyond heterobulk junction solar cells, in photoelectrochemical devices.In this regard, fullerenes chemical tailoring has been aimed to:
a) The synthesis of higher LUMO fullerene derivatives to achieve a higher energy gap and therefore, to facilitate further reduction processes.
b) The synthesis of catalytically active fullerenes derivatives bearing catalytic sites where the reduction process could occur. The latter strategy could be, in turn, subdivided in the preparation of all organic fullerene catalysts and of hybrid metallo-fullerene compounds where fullerenes are endowed with active metals such as palladium, platinum or iridium.
[1] B. C. Thompson, J. M. J. Fréchet, Angewandte Chemie International Edition 2008, 47, 58-77.
[2] J. L. Delgado, P.-A. Bouit, S. Filippone, M. A. Herranz, N. Martin, Chemical Communications 2010, 46, 4853-4865.
[3] A. J. Heeger, Advanced Materials 2014, 26, 10-28.
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