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Related Concept Videos

Entropy and Solvation02:05

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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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Cosolvent-Modulated Donor Preaggregation Enhances Molecular Order in 20% Efficient Bilayer Organic Solar Cells.

Wei Pang1, Sein Chung2, Jiancheng Zhong1

  • 1Center on Nanoenergy Research, Institute of Science and Technology for Carbon Peak & Neutrality, School of Physical Science & Technology, Guangxi University, Nanning 530004, China.

ACS Applied Materials & Interfaces
|April 26, 2026
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Summary

Adding a small amount of dichloromethane (DCM) to chloroform (CF) solvent enhances polymer donor preaggregation in bilayer organic solar cells (OSCs). This improves molecular ordering and charge transport, leading to a high 20.0% power conversion efficiency for these devices.

Keywords:
bilayer organic solar cellscharge transportcosolventdonor preaggregationfiber sizemolecular order

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Solvent selection is crucial for active layer morphology and performance in bilayer organic solar cells (OSCs).
  • Common solvents for polymer donors lead to small aggregate sizes, hindering charge transport.
  • Controlling polymer aggregation is key to optimizing OSC efficiency.

Purpose of the Study:

  • To investigate the effect of trace dichloromethane (DCM) addition to chloroform (CF) on polymer donor aggregation.
  • To enhance molecular ordering, crystallinity, and charge transport in bilayer OSCs.
  • To achieve high power conversion efficiencies in binary bilayer OSCs.

Main Methods:

  • Processing bilayer OSCs using a cosolvent system of chloroform (CF) and dichloromethane (DCM).
  • Analyzing the impact of the cosolvent on donor preaggregation, fiber size, crystallinity, and molecular ordering.
  • Evaluating device performance metrics including efficiency, recombination, trap density, carrier lifetime, and mobility.

Main Results:

  • Trace DCM addition to CF effectively modulated donor preaggregation, enabling precise fiber size control.
  • The cosolvent processing increased crystallinity and enhanced molecular ordering, facilitating efficient charge transport.
  • Bilayer OSCs processed with CF/DCM achieved a notable 20.0% power conversion efficiency.
  • This strategy suppressed bimolecular recombination, reduced trap density, extended carrier lifetime, and enhanced carrier mobility.

Conclusions:

  • Manipulating donor preaggregation states via cosolvent processing is a viable strategy for advancing bilayer OSC performance.
  • The developed method leads to superior molecular organization and improved charge extraction efficiency.
  • The achieved 20.0% efficiency marks a significant advancement for binary bilayer OSCs.