Supramolecular n/p-heterojunction photosystems with antiparallel redox gradients in electron- and hole-transporting pathways.
J Am Chem Soc
; 132(20): 6923-5, 2010 May 26.
Article
em En
| MEDLINE
| ID: mdl-20426476
ABSTRACT
Lessons from nature call for supramolecular n/p-heterojunctions with oriented multicolored antiparallel redox gradients (OMARG-SHJs) as "ideal" photosystems. Their design combines advantages of bilayer and bulk n/p-heterojunction (BHJ) solar cells for the directional separation of photogenerated charges before recombination can occur. Although conceptually attractive, OMARG-SHJs have remained beyond reach because of unresolved challenges in synthetic organic and supramolecular chemistry. Here we report the first OMARG-SHJs with two-component redox gradients in both the electron- and hole-transporting pathways. They were obtained by zipper assembly of stacks of red naphthalenediimide (NDI) electron donors along strings of oligophenylethynyl hole acceptors on top of yellow NDI electron acceptors along p-oligophenyl hole donors. The presence of both gradients is shown to be essential for achieving photoinduced charge separation over very long distances.
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MEDLINE
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En
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J Am Chem Soc
Ano de publicação:
2010
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Article
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