Abstract
Solution-printed organic semiconductors have emerged in recent years as promising contenders for roll-to-roll manufacturing of electronic and optoelectronic circuits. The stringent performance requirements for organic thin-film transistors (OTFTs) in terms of carrier mobility, switching speed, turn-on voltage and uniformity over large areas require performance currently achieved by organic single-crystal devices, but these suffer from scale-up challenges. Here we present a new method based on blade coating of a blend of conjugated small molecules and amorphous insulating polymers to produce OTFTs with consistently excellent performance characteristics (carrier mobility as high as 6.7 cm2 V−1 s−1, low threshold voltages of<1 V and low subthreshold swings <0.5 V dec−1). Our findings demonstrate that careful control over phase separation and crystallization can yield solution-printed polycrystalline organic semiconductor films with transport properties and other figures of merit on par with their single-crystal counterparts.
Highlights
Solution-printed organic semiconductors have emerged in recent years as promising contenders for roll-to-roll manufacturing of electronic and optoelectronic circuits
Efforts in the past decade to carefully engineer the molecular structure of soluble Organic semiconductors (OSCs) and control their microstructure and morphology have led to carrier mobilities far surpassing those of amorphous silicon—the current industrial standard TFT material[8,9,10], and have been shown to achieve mobilities even in excess of 10 cm[2] V À 1 s À 1
The common problem with existing OSC:polymer blend organic thin-film transistors (OTFTs) is that processing typically occurs via spin coating, a process which is highly wasteful of expensive semiconductor and is not compatible with continuous highthroughput roll-to-roll manufacturing
Summary
Solution-printed organic semiconductors have emerged in recent years as promising contenders for roll-to-roll manufacturing of electronic and optoelectronic circuits.
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