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Related Concept Videos

P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Related Experiment Video

Updated: May 17, 2026

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
08:29

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

Published on: January 10, 2017

Solution-processed bulk-heterojunction solar cells containing self-organized disk-shaped donors.

Keisuke Takemoto1, Masayoshi Karasawa, Mutsumi Kimura

  • 1Faculty of Textile Science and Technology, Shinshu University, Ueda 386-8567, Japan.

ACS Applied Materials & Interfaces
|October 18, 2012
PubMed
Summary

Novel disk-shaped molecules function as efficient electron donors in solution-processed bulk-heterojunction solar cells. These organic materials exhibit ordered structures, leading to a power conversion efficiency of 2.6%.

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Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization
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Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization

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Last Updated: May 17, 2026

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
08:29

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Published on: January 10, 2017

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
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In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

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Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization
07:32

Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization

Published on: January 29, 2017

Area of Science:

  • Organic electronics
  • Materials science
  • Photovoltaics

Background:

  • Molecular disks with pyrene cores and oligothiophene arms were synthesized.
  • These molecules possess peripheral alkyl chains influencing their properties.

Purpose of the Study:

  • To synthesize and characterize novel disk-shaped molecules for solar cell applications.
  • To evaluate their potential as electron donor components in bulk-heterojunction solar cells.

Main Methods:

  • Optical and redox properties were analyzed in solution and solid films.
  • Self-assembly and ordered structure formation were investigated using TPOM, DSC, and XRD.
  • Solution-processed bulk-heterojunction solar cells were fabricated and tested.

Main Results:

  • The synthesized molecules (1 and 2) exhibit suitable lowest unoccupied molecular orbital (LUMO) energy levels for electron transfer to fullerene acceptors.
  • Disk-shaped molecules self-organized into ordered structures via intermolecular π-π interactions.
  • Solar cells utilizing disk-shaped donors achieved a power conversion efficiency (PCE) of 2.6%.

Conclusions:

  • The synthesized disk-shaped molecules are promising electron donor materials for organic solar cells.
  • Molecular design and self-assembly significantly impact device performance.
  • Oligothiophene length influences the performance of the fabricated solar cell devices.