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Published on: July 5, 2019
Solution-assisted assembly of organic semiconducting single crystals on surfaces with patterned wettability
Shuhong Liu1, Wechung Maria Wang, Stefan C B Mannsfeld
1Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|June 6, 2007
Summary
Researchers developed two methods for assembling organic semiconducting single crystals using patterned wettability. This technique enables precise control over crystal deposition and alignment for electronic device fabrication.
Area of Science:
- Materials Science
- Organic Electronics
- Surface Chemistry
Background:
- Organic semiconductors are crucial for flexible electronics.
- Efficient methods for assembling ordered organic single crystals are needed.
- Controlling crystal growth and placement is a key challenge.
Purpose of the Study:
- To present two novel, efficient methods for assembling organic semiconducting single crystals.
- To demonstrate the use of patterned wettability for directed crystal assembly.
- To showcase the fabrication of organic electronic devices using these methods.
Main Methods:
- Utilizing solvent wetting and dewetting phenomena on substrates with patterned wettability.
- Functionalizing substrates with self-assembled monolayers (SAMs) to control surface energy.
- Designing line features on substrates to direct crystal alignment.
Main Results:
- Successful assembly of various organic crystals over centimeter-squared areas on diverse substrates (Au, SiO2, flexible plastics).
- Achieved alignment of organic crystals, such as copper phthalocyanine (CuPc) needles, using substrate patterning.
- Fabricated arrays of single-crystal organic field-effect transistors (OFETs) by patterning crystals directly onto electrodes.
Conclusions:
- The described methods provide efficient and scalable approaches for organic single crystal assembly.
- Patterned wettability offers a versatile platform for controlling crystal deposition, alignment, and device integration.
- This technique holds significant potential for advancing the fabrication of high-performance organic electronic devices.
