All‐Printed Flexible Organic Transistors Enabled by Surface Tension‐Guided Blade Coating

Abstract

A combination of surface energy-guided blade coating and inkjet printing is used to fabricate an all-printed high performance, high yield, and low variability organic thin film transistor (OTFT) array on a plastic substrate. Functional inks and printing processes were optimized to yield self-assembled homogenous thin films in every layer of the OTFT stack. Specifically, we investigated the effect of capillary number, semiconductor ink composition (small molecule-polymer ratio), and additive high boiling point solvent concentrations on film fidelity, pattern design, device performance and yields.

Charge-integrating organic heterojunction phototransistors for wide-dynamic-range image sensors

“…1c, because this effect is not observed for high-mobility materials deposited directly on PEDOT:PSS (ref. 42). The contact barrier is probably higher than 300 meV, because fullerene-based acceptors have been shown to segregate to the bottom interface 47 .…”

“…The heterojunction channel is deposited on top of PEDOT:PSS sourcedrain electrodes printed on a flexible plastic substrate using surfaceenergy-patterned doctor blade coating, previously developed for organic TFTs (ref. 42). A fluoropolymer gate dielectric is blanketcoated over the whole substrate with aluminium forming the gate electrode.…”

Photoinduced p‐ to n‐type Switching in Thermoelectric Polymer‐Carbon Nanotube Composites

“…[ 7,8 ] The fully lowcost potential relies, however, on achieving realistic performance while keeping the processing schemes simple, including patterning of different materials. [9][10][11] Organic thermoelectric generators offer the potential for a cost-effective technology to harvest low temperature waste heat. [ 8,11 ] While it is possible to build complete thermoelectric modules from a single type of thermoelectric material (either p-or n-type) and interconnect them with a regular conductor, only half of the legs will actually generate a thermovoltage.…”

A Ladder-Type Organosilicate Copolymer Gate Dielectric Materials for Organic Thin-Film Transistors

“…Organic thin-film transistors (OTFTs) have been an important research subject because they are indispensable elements in the development of low-cost, large-area electronics, such as paper-based displays, smart cards, radio-frequency ID tags, and sensors [1][2][3][4][5][6][7][8]. Among the fundamental components of OTFTs, namely the semiconductor, dielectric, and conductor, studies on the development and application of organic semiconducting materials have intensively been performed for the last few decades [9][10][11][12][13][14][15][16][17][18].…”