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Optoelectronically mismatched oligophenylethynyl-naphthalenediimide SHJ architectures.
Santanu Maity1, Rajesh Bhosale, Natalie Banerji
1Department of Organic, University of Geneva, Geneva, Switzerland.
Organic & Biomolecular Chemistry
|February 19, 2010
Summary
This study demonstrates photoinduced electron transfer in novel surface zipper architectures. Oligophenylethynyl-naphthalenediimide (OPE-NDI) systems generate photocurrents via ultrafast charge separation, forming supramolecular heterojunctions.
Area of Science:
- Materials Science
- Organic Electronics
- Supramolecular Chemistry
Background:
- Investigating photoinduced electron transfer is crucial for developing advanced electronic materials.
- Surface architectures offer unique platforms for controlling charge transfer dynamics.
- Naphthalenediimides (NDIs) and oligophenylethynyl (OPE) are key components in organic electronics.
Purpose of the Study:
- To evaluate photoinduced electron transfer in surface "zipper" architectures.
- To synthesize and characterize multichromophoric oligophenylethynyl-blue naphthalenediimide (OPE-B) systems.
- To explore the influence of intramolecular stacking on OPE planarity, absorption, and conductivity.
Main Methods:
- Synthesis and characterization of anionic and cationic OPE-B systems.
- Fabrication of surface architectures using zipper and layer-by-layer (LBL) assembly.
- Photocurrent generation measurements and analysis of critical thickness and fill factors.
Main Results:
- OPE-B zipper architectures exhibited superior critical thickness and fill factors compared to other assembly methods.
- Ultrafast electron transfer from OPE rods to NDIs generated significant photocurrents.
- OPEs were the primary photocurrent generators, not the blue NDIs.
Conclusions:
- Topologically matching zipper architectures are functionally relevant for charge separation.
- Wavelength-controlled rod-stack charge separation creates supramolecular n/p-heterojunctions (SHJs).
- Further scaffold modification is needed to integrate blue NDIs effectively into SHJ photosystems.
