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Bimodal crystallization at polymer-fullerene interfaces.

Dyfrig Môn1, Anthony M Higgins, David James

  • 1College of Engineering, Swansea University, Singleton Park, Swansea, SA2 8PP, UK. a.m.higgins@swansea.ac.uk.

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Summary
This summary is machine-generated.

The thickness of polymer layers controls the crystal growth of [6,6]-phenyl C61-butyric acid methyl ester (PCBM). Thinner polymer films accelerate nanoscale crystal growth, potentially due to increased polymer chain mobility in these organic electronic materials.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Crystallization Science

Background:

  • Understanding crystal growth in organic electronic materials is crucial for device performance.
  • Polymer-PCBM blends are widely used in organic photovoltaics and transistors.
  • Controlling crystallization kinetics at different length scales remains a challenge.

Purpose of the Study:

  • To investigate the influence of polymer layer thickness on the growth kinetics of [6,6]-phenyl C61-butyric acid methyl ester (PCBM) crystals.
  • To elucidate the relationship between nanoscale and micron-sized crystal growth.
  • To explore the role of polymer chain dynamics in PCBM crystallization.

Main Methods:

  • In situ optical microscopy to observe crystal growth dynamics.
  • Grazing-incidence X-ray diffraction (GIXD) to analyze crystal structure and orientation.
  • Neutron reflectivity to determine interfacial composition and layer structure.
  • Variable polymer film thickness and molecular weight studies.

Main Results:

  • Polymer layer thickness dictates PCBM crystal growth kinetics at nanoscale and micron scales.
  • Faster growth of nanoscale PCBM crystals hinders the development of larger, needle-like crystals.
  • A liquid-liquid equilibrium establishes between PCBM and polymer-rich layers prior to crystallization.
  • Nanoscale PCBM crystal growth rate increases with decreasing polymer film thickness.
  • This thickness-dependent behavior is consistent across different polymer molecular weights.

Conclusions:

  • Polymer film thickness is a critical parameter for controlling PCBM crystallization in bilayers.
  • Enhanced local polymer chain mobility in thinner films likely accelerates nanoscale crystal growth.
  • Findings provide insights into morphology control for organic electronic devices.