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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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Updated: Jul 14, 2026

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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Organic Solar Cells with Solution-Processed Carbon Top Electrodes.

Florian Zimmermann1,2, Pang Wang1,2, Christian Tückmantel1,2

  • 1Institute of Electronic Devices, University of Wuppertal, Wuppertal 42119, Germany.

ACS Applied Materials & Interfaces
|July 13, 2026
PubMed
Summary

Researchers developed the first organic solar cells (OSCs) using a solution-processed carbon top electrode. This sustainable alternative to metal contacts achieves 11% power conversion efficiency, paving the way for eco-friendly manufacturing.

Keywords:
atomic layer depositioncarbon pastenonfullerene acceptororganic solar cellspermeation barriersolution-processed

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Organic Electronics

Background:

  • Organic solar cells (OSCs) offer sustainable, low-cost manufacturing potential.
  • Current OSCs predominantly use expensive, evaporated metal electrodes (e.g., silver, gold).
  • There is a need for cost-effective, scalable, and environmentally friendly electrode materials for OSCs.

Purpose of the Study:

  • To demonstrate the first organic solar cells (OSCs) utilizing a fully solution-processed, doctor-bladed carbon top electrode.
  • To develop a robust electron transport layer (ETL) architecture protecting underlying organic layers from carbon paste solvents.
  • To enhance the electronic interface between the carbon electrode and the ETL for improved performance and reproducibility.

Main Methods:

  • Fabrication of OSCs with a doctor-bladed carbon top electrode.
  • Development of a dual-layer ETL: solution-processed aluminum-doped zinc oxide nanoparticles (AZO-NPs) followed by atomic layer deposition (ALD) tin oxide (SnOx).
  • Insertion of an ultrathin ALD-indium oxide (InOx) layer to improve electrode-ETL interface and electron transport.

Main Results:

  • The developed ETL architecture effectively protected the organic layers from carbon paste solvents.
  • The ultrathin InOx layer significantly improved reproducibility and facilitated lateral electron transport.
  • OSCs with the carbon top electrode achieved a power conversion efficiency of 11%.

Conclusions:

  • A fully solution-processed carbon top electrode is a viable, low-cost, and recyclable alternative to traditional metal electrodes in OSCs.
  • The novel ETL architecture is crucial for enabling the use of solution-processed electrodes.
  • This work presents a promising pathway toward sustainable, scalable, and resource-efficient OSC manufacturing.