Molecularly Smooth Self-Assembled Monolayer for High-Mobility Organic Field-Effect Transistors

作者：Das Saurabh; Lee Byoung Hoon; Linstadt Roscoe T H; Cunha Keila; Li Youli; Kaufman Yair; Levine Zachary A; Lipshutz Bruce H; Lins Roberto D; Shea Joan Emma; Heeger Alan J^*; Ahn B Kollbe^*

来源：Nano Letters, 2016, 16(10): 6709-6715.

DOI：10.1021/acs.nanolett.6b03860

• organic field-effect transistor
• polysiloxane
• zwitterionic molecules
• bioinspired self-assembled monolayer
• nanofabrication

Despite the need for molecularly smooth self assembled monolayers (SAMs) on silicon dioxide surfaces (the most common dielectric surface), current techniques are limited to nonideal silane grafting. Here, we show unique bioinspired zwitterionic molecules forming a molecularly smooth and uniformly thin SAM in "water" in <1 min on various dielectric surfaces, which enables a dip-coating process that is essential for organic electronics to become reality. This monomolecular layer leads to high mobility of organic field-effect transistors (OFETs) based on various organic semiconductors and source/drain electrodes. A combination of experimental and computational techniques confirms strong adsorption (W-ad > 20 mJ m(-2)), uniform thickness (similar to 0.5 or similar to 1 nm) and orientation (all catechol head groups facing the oxide surface) of the "monomolecular" layers. This robust (strong adsorption), rapid, and green SAM represents a promising advancement toward the next generation of nanofabrication compared to the current nonuniform and inconsistent polysiloxane-based SAM involving toxic chemicals, long processing time (>10 h), or heat (>80 degrees C).

• 出版日期2016-10