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Related Concept Videos

Solution Equilibrium and Saturation01:59

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Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
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Many common substances around us exist as a solution, such as ocean water, air, and gasoline. All solutions are mixtures of substances that are composed of varying amounts of two or more types of atoms or molecules. A mixture with a non-uniform composition is a heterogeneous mixture, whereas a mixture with a uniform composition is a homogeneous mixture. The components that make the homogeneous mixture are evenly spread out and thoroughly mixed. 
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Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
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Organic Heterojunctions Formed by Interfacing Two Single Crystals from a Mixed Solution.

Huanbin Li1,2, Jiake Wu1,2, Kohtaro Takahashi3

  • 1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering , Zhejiang University , Hangzhou 310027 , China.

Journal of the American Chemical Society
|June 28, 2019
PubMed
Summary

Researchers developed a new method to create high-quality organic heterojunctions using single crystals. This technique enables precise control over molecular packing, leading to improved performance in organic electronic devices.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Crystallography

Background:

  • Organic heterojunctions are crucial components in organic electronics.
  • Achieving well-ordered molecular packing in heterojunctions is challenging.
  • Forming single-crystalline heterojunctions from organic semiconductors is difficult.

Purpose of the Study:

  • To develop a method for creating organic heterojunctions from interfaced single crystals.
  • To understand the crystallization mechanisms of organic semiconductors from solution droplets.
  • To investigate the charge transport properties of the resulting single-crystalline heterojunctions.

Main Methods:

  • Crystallization of six organic semiconductors from mixed solution droplets on various substrates.
  • Observation and analysis of crystallization mechanisms at air-solution and solution-substrate interfaces.
  • Fabrication and characterization of organic field-effect transistors (OFETs) using the formed heterojunctions.

Main Results:

  • Identified two distinct crystallization mechanisms based on interface preference (top or bottom).
  • Demonstrated that crystallization preference is tunable by substrate selection, indicating substrate-semiconductor interaction importance.
  • Successfully formed bilayer single crystals yielding organic heterojunctions with ambipolar charge transport.
  • Achieved high electron mobility of 1.90 cm² Vâ¹ sâ¹ and hole mobility of 1.02 cm² Vâ¹ sâ¹.

Conclusions:

  • Elucidating interfacial crystallization events is key to controlling organic heterojunction formation.
  • The developed method allows for solution-grown organic single-crystalline heterojunctions with excellent charge transport properties.
  • This work paves the way for advanced organic electronic devices utilizing precisely engineered heterojunctions.