Supramolecular n/p-heterojunction photosystems with antiparallel redox gradients in electron- and hole-transporting pathways

Journal of the American Chemical Society

Volumn 132, Issue 20, 2010, Pages 6923-6925

  Sakai, Naomi ^a   Bhosale, Rajesh ^a   Emery, Daniel ^a   Mareda, Jiri ^a   Matile, Stefan ^a  

^a UNIVERSITY OF GENEVA   (Switzerland)

Author keywords

[No Author keywords available]

Indexed keywords

BI-LAYER; DIRECTIONAL SEPARATION; ELECTRON ACCEPTOR; ELECTRON DONORS; HOLE TRANSPORTING; LONG DISTANCES; PHOTOGENERATED CHARGE; PHOTOINDUCED CHARGE SEPARATION; PHOTOSYSTEMS; REDOX GRADIENTS; TWO-COMPONENT;

ELECTRONS; SUPRAMOLECULAR CHEMISTRY;

HETEROJUNCTIONS;

ARTICLE; CHEMICAL STRUCTURE; ELECTRON; MOLECULAR DYNAMICS; NUCLEAR MAGNETIC RESONANCE; OXIDATION REDUCTION STATE; PHOTOSYNTHESIS; SIMULATION;

EID: 77952573939     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja101944r     Document Type: Article

References (18)

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14. See the Supporting Information.
15. The higher photocurrents and greater mass deposited with R zippers than Y zippers can be explained by incomplete layer formation with POP-Y (or, less likely, overzipping with R). The slower assembly kinetics according to photocurrent generation with Y zippers (2 days) in comparison with R zippers (<1 day) and LBL controls (12, 13) as well as the smooth surfaces in all zippers (12, 13) imply the occurrence of extensive self-repair of incomplete layers with continuing assembly. The number of permanent errors in zipper architectures should differ for different monomer structures. Vigorous functional controls (capping, LBL), smooth surfaces, and high (in comparison with relevant controls) fill factors, photocurrents, critical thickness, etc., imply that the overall error frequency was low.
16. Absolute photocurrent densities were not maximized, as they were not the main concern of this study. Elimination of surface plasmon resonance (SPR) quenching (using surfaces other than gold) (12, 13) and total oxygen exclusion (glovebox level), among other things, would be expected to boost the photocurrent. The reproducibility in experiments with identical materials was excellent (Figure 4), and the batch-to-batch reproducibility was reasonable.
17. The film thickness could be estimated assuming ∼2 nm per layer, which is in accordance with the proposed suprastructure (Figure 1) and preliminary ellipsometry/SPR studies.
18. - forms in femtoseconds. (12)