Solution-Prepared Hybrid-Nanoparticle Dielectrics for High-Performance Low-Voltage Organic Thin-Film Transistors

Abstract

Oleic acid capped barium strontium titanate (OA-BST) nanoparticles were synthesized for solution-prepared dielectrics in organic thin-film transistors (OTFTs). The as-synthesized nanoparticles were well-dispersed in organic solvents to deposit very homogeneous dielectric films by direct spin coating. Bottom-gate pentacene TFTs fabricated using these nanoparticle dielectric films showed high mobilities of 1-2 cm(2) V(-1) s(-1) with on/off ratios of 10(3) under a low driven voltage of -2.5 V. Top-gate poly(3,3'''-didodecylquaterthiophene) (PQT-12) TFTs with nanoparticle dielectrics also exhibited a low-voltage operation (-5 V) performance with mobilities of 0.01-0.1 cm(2) V(-1) s(-1) and on/off ratios of 10(3)-10(4). Detailed studies on the gate voltage-dependent mobility of the devices showed that only a low gate electric field needed to achieve the saturated mobility for the OA-BST-based pentacene OTFTs could be attributed to the low trapped-state densities (<3.9 x 10(11) cm(-2)) at the dielectric/semiconductor interfaces for these devices.

High‐Performance Partially Aligned Semiconductive Single‐Walled Carbon Nanotube Transistors Achieved with a Parallel Technique

“…Solution processable dielectric materials e.g. cross‐linked polyvinylphenol and poly(styrene‐block‐ethylene oxide‐block‐styrene) have been applied in printed device fabrications 71–73. However, these dielectrics may not be as effective as vacuum‐deposited HfO 2 and partial alignment reported here offers another route towards achieving high performance FETs.…”

Dielectric properties of poly(4-vinylphenol) with embedded PbO nanoparticles

“…Therefore, based on the FT-IR and O 1s PES results, it can be concluded that pristine polymer films undergo surface absorption of moisture, and that the increased number of hydroxyl groups present increases charge trapping. [27,28] The binding energies of O 1s photoelectrons in O-Pb and O-H bonds have been reported as 529.5 eV and 531 eV, respectively. [29,30] In Fig.…”

Green Processing of Metal Oxide Core–Shell Nanoparticles as Low‐Temperature Dielectrics in Organic Thin‐Film Transistors

“…For instance, the processing of UV‐absorbing or photoactive metal oxide materials for cosmetic or bio‐oriented applications under neutral pH conditions would be essential to enable applications in life‐science products or pharmaceutics . Classical thin‐film engineering approaches with focus on sustainable methods with nontoxic materials and solvents as can be found in the fabrication of photovoltaics, transistor devices, and water soluble transient electronics applications . Solution processing of metal oxide nanoparticles (NPs) often involves the use of surfactants in order to inhibit particle growth and aggregation.…”

“…Solution processing of metal oxide nanoparticles (NPs) often involves the use of surfactants in order to inhibit particle growth and aggregation. Due to the amphiphilic nature of these surfactants the nanoparticle surface is typically rendered highly hydrophobic, which challenges the use of environmentally desirable solvents such as water and lower alcohols …”