Related Experiment Video
Updated: Dec 15, 2025
18:11
Microfluidic Chips Controlled with Elastomeric Microvalve Arrays
Published on: October 1, 2007
21.6K
Mixed-flow design for microfluidic printing of two-component polymer semiconductor systems.
Gang Wang1,2,3, Liang-Wen Feng2,3, Wei Huang2,3
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, International Joint Laboratory for Advanced Fiber and Low-Dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China.
Summary
A new mixed-flow microfluidic printing (MFMP) method improves phase purity in two-component conjugated polymer systems. This advance enhances performance for printed organic electronics like solar cells and transistors.
Area of Science:
- Materials Science
- Organic Electronics
- Polymer Chemistry
Background:
- Achieving high phase purity in two-component conjugated polymer systems is critical for printed soft-matter electronics.
- Conventional printing methods often struggle to control blend morphology, limiting device performance.
Purpose of the Study:
- To develop and demonstrate a novel mixed-flow microfluidic printing (MFMP) approach for creating two-component conjugated polymer systems with enhanced phase purity.
- To investigate the impact of MFMP on the morphology and performance of bulk-heterojunction solar cells and thin-film transistors.
Main Methods:
- Utilized a microfluidic system integrating laminar and extensional flows with a custom microstructured shear blade.
- Employed fluid flow simulations to design the shear blade for optimized flow patterns (shear, stretch, pushout effects).
- Characterized polymer conformation and blend order using techniques including AFM, TEM, GIWAXS, and R-SoXS.
Main Results:
- MFMP significantly improved phase purity and blend order in two-component polymer systems.
- Printed all-polymer solar cells (J51:N2200) achieved a power conversion efficiency of 7.80% with MFMP, compared to 5.20% with conventional blade coating.
- Enhanced performance was also observed in ambipolar and unipolar thin-film transistors fabricated using MFMP.
Conclusions:
- The MFMP approach offers a versatile and effective method for fabricating high-performance two-component conjugated polymer systems.
- This printing methodology enables precise control over polymer morphology, leading to improved optoelectronic device characteristics.
- MFMP represents a significant advancement for the development of next-generation printed organic electronics.
