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Title: Solution-processable barium titanate and strontium titanate nanoparticle dielectrics for low-voltage organic thin-film transistors
Authors: Chan-Park, Mary B.
Cai, Qin Jia
Gan, Ye
Yang, Hongbin
Lu, Zhisong
Li, Chang Ming
Guo, Jun
Dong, Zhili
Keywords: DRNTU::Engineering::Materials::Microelectronics and semiconductor materials::Thin films
Issue Date: 2009
Source: Cai, Q. J., Gan, Y., Chan-Park, M. B., Yang, H. B., Lu, Z. S., Li, C. M., & et al. (2009). Solution-Processable Barium Titanate and Strontium Titanate Nanoparticle Dielectrics for Low-Voltage Organic Thin-Film Transistors. Chemistry of Materials, 21 (14), 3153–3161.
Series/Report no.: Chemistry of materials
Abstract: A series of solution-processable oleic-acid capped barium titanate and strontium titanate nanoparticles was synthesized and spin-coated to form homogeneous high-k dielectric films for organic thin-film transistors (TFTs). The dielectric constant k of the nanoparticle films was tunable in the range from 4.1 to 9.3 by altering the molar ratio of oleic-acid surfactant to synthesis precursor. Low-voltage modulated high-performance organic TFTs were fabricated using nanoparticle films as the dielectric components. Flexible bottom-gate pentacene TFTs exhibited outstanding device performance with field-effect mobility, μ, in the range of 2.0−3.5 cm2 V−1 s−1 and on/off ratios of about 1 × 104 at low gate voltage. Top-gate poly(3,3′′′-didodecylquaterthiophene) TFTs also showed high device performance with μ of 0.05−0.1 cm2 V−1 s−1 and on/off ratios of 1 × 103 to 1 × 104. The low-voltage performance of the TFTs could be attributed to a low density of trapped states at the interfaces between the organic semiconductors and the nanoparticle dielectric films. This research provides a series of promising dielectric materials for fabrication of superior organic TFTs through a solution process and fundamentally suggests that low trapped state density at the semiconductor/dielectrics interface may be an important factor to achieve low-voltage modulation in organic TFTs.
DOI: 10.1021/cm900532q
Rights: © 2009 American Chemical Society
Fulltext Permission: none
Fulltext Availability: No Fulltext
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