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Surface architectures built around perylenediimide stacks.

Pierre Charbonnaz1, Yingjie Zhao, Raluca Turdean

  • 1Department of Organic Chemistry, University of Geneva, Geneva (Switzerland), Fax: (+41) 22-379-3215.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 22, 2014
PubMed
Summary
This summary is machine-generated.

Simple perylenediimide (PDI) photosystems show high activity. Multicomponent architectures with PDI and naphthalenediimide (NDI) stacks improved long-distance charge transport, outperforming single-channel designs.

Keywords:
hydrazonesorganic electronicsperylenediimidesphotosystemspolymerizationsurfaces and interfaces

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Perylenediimide (PDI) stacks exhibit high intrinsic activity for photocurrent generation due to strong light absorption and efficient charge transport.
  • Simple PDI photosystems serve as a foundation for constructing complex multicomponent architectures.
  • Existing PDI systems possess high performance, necessitating exploration of advanced designs for further improvement.

Purpose of the Study:

  • To investigate if sophisticated multicomponent architectures can enhance the performance of PDI-based photosystems.
  • To evaluate the impact of directional ion or charge-transporting stacks on PDI activity.
  • To compare the efficiency of single, double, and triple-channel photosystem designs.

Main Methods:

  • Fabrication of multicomponent photosystems using perylenediimides (PDIs), naphthalenediimides (NDIs), oligothiophenes, and triphenylamines.
  • Systematic variation of channel number (single, double, triple) and stack thickness/length.
  • Measurement of photocurrent generation and charge transport efficiency under standard conditions.

Main Results:

  • Directional construction of ion or charge-transporting stacks (NDIs, oligothiophenes) did not significantly improve PDI activity.
  • Double-channel photosystems (PDI/NDI) showed increased activity with thickness, indicating efficient long-distance charge transport.
  • Single-channel PDI stacks showed decreased activity with length due to charge recombination, while triple-channel systems were less active.

Conclusions:

  • The intrinsic activity of PDI stacks is a limiting factor for ion-gated systems.
  • Double-channel PDI/NDI photosystems offer the most efficient long-distance charge transport, suggesting superior hole transport in PDI stacks.
  • Multicomponent architectures require careful design to avoid charge recombination and maximize photocurrent generation.