Solution-Processed Donor-Acceptor Polymer Nanowire Network Semiconductors For High-Performance Field-Effect...

Area of Science:

• Materials Science
• Organic Electronics
• Semiconductor Physics

Background:

• Organic field-effect transistors (OFETs) offer a path to low-cost, large-area, and flexible electronics.
• Conjugated donor-acceptor (D-A) polymers are key semiconductor materials for OFETs.
• High-molecular-weight D-A polymers provide high mobility but have poor solubility, while low-molecular-weight polymers are soluble but have low mobility.

Purpose of the Study:

• To develop a facile solution process for transforming low-molecular-weight (MW) D-A polymers into high-mobility semiconductors.
• To overcome the trade-off between solubility and charge transport properties in D-A polymer semiconductors for OFETs.

Main Methods:

• Utilized a blend of a low-MW diketopyrrolopyrrole-dithienylthieno[3,2-b]thiophene (I) and polystyrene.
• Employed a solution fabrication technique to create the semiconductor channel film.
• Leveraged the cooperative motion of polystyrene chain segments to induce self-assembly and crystallization of polymer (I).

Main Results:

• Achieved a highly crystalline semiconductor with an interpenetrating nanowire network structure within the polystyrene matrix.
• Demonstrated significantly enhanced field-effect mobility exceeding 8 cm²V⁻¹s⁻¹.
• Reported a high on/off ratio of 10⁷, meeting critical requirements for impactful OFET applications.

Conclusions:

• The developed solution process effectively enhances the crystalline order and charge transport properties of low-MW D-A polymers.
• This approach provides a viable strategy for fabricating high-performance semiconductor materials for next-generation OFETs.
• The resulting materials exhibit properties suitable for practical, large-area, and flexible electronic applications.