Impact of Relative Humidity during Spin-Deposition of Metal Oxide Thin Films from Aqueous Solution Precursors

Plassmeyer, Paul N.; Mitchson, Gavin; Woods, Keenan N.; Johnson, David C.; Page, Catherine J.

doi:10.1021/acs.chemmater.6b05200

Cited by 26 publications

(21 citation statements)

References 40 publications

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“…In the following works, the simple and ecofriendly water‐inducement method was demonstrated to be compatible with a wide range of solution‐based film fabrication techniques (e.g., spin/spray coating and printing) . It is noted that the environmental humidity had great effect on the film coating process and the low humidity (<20%) was mandatory for the uniform film formation and the good device performance …”

Section: Metal Oxide Tftsmentioning

confidence: 97%

Printable Semiconductors for Backplane TFTs of Flexible OLED Displays

Zhu

Shin

Liu

et al. 2019

Adv Funct Materials

168

130

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Studies on printable semiconductors and technologies have increased rapidly over recent decades, pioneering novel applications in many fields, such as energy, sensing, logic circuits, and information displays. The newest display technologies are already turning to metal oxide semiconductors, i.e., indium gallium zinc oxide, for the improvements needed to drive active matrix organic light-emitting diodes. Convenience and portability will be realized with flexible and wearable displays in the future. This report summarizes recent progress on the development of solution-processed thin film transistors, especially those deposited at low temperatures for next-generation flexible smart displays. The first part provides an overview on the history and current status of displays. Then, recent advances in state-of-the-art solution-processed transistors based on different semiconductors are presented, including metal oxides, organic materials, perovskites, and carbon nanotubes. Finally, conclusions are drawn and the remaining challenges and future perspectives are discussed. a large common cathode (opaque metal). This means that the light emission goes through the backplane and the TFT arrays are able to block the light, resulting in the reduced emission fill factor of the display. This mode is also called bottom emission. One effective way to avoid the light obstruction from TFTs in the backplane is to use top-emitting OLEDs, which have a transparent cathode. [2] In 2004, Pennsylvania State University demonstrated the first flexible phosphorescent AMOLED display with hydrogenated amorphous silicon on a 4 in. polyimide (PI) substrate. [7] One year later, a 48 × 48 organic pentacene TFT-driven AMOLED display on a polyethylene terephthalate (PET) substrate was reported by the same group. [8] In 2005, by employing a top-emission structure, researchers at Sony Corp. demonstrated the first full-color imaging on a flexible AMOLED with a pixel resolution of 80 ppi. [9] In 2013, Samsung Electronics showed curved OLED TVs for the first time. Two years later, the same company unveiled a smartphone with a curved edge display (Galaxy S6 Edge), which used touch sensors to improve the user interface and device design. Most recently, LG Display succeeded in developing the world's first large-size 77 in. transparent and flexible OLED display, which could be rolled up to a radius of 80 mm. [10] The ideal flexible AMOLED backplane should be robust, rollable/bendable, capable of complementary metal oxide semiconductor (CMOS) operation, and should lend itself to low-cost manufacturing. To advance toward next-generation flexible AMOLED displays, two key technological goals should be satisfied during fabrication. One is to develop TFT backplanes with good uniformity, stability, and electrical performance. Amorphous silicon (a-Si) TFTs are well known for their uniform electrical characteristics (µ FE < 1 cm 2 V −1 s −1 and I on /I off > 10 6 ) and have achieved great success in flat-panel LCD displays. However, the relatively low µ FE and the lig...

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Section: Metal Oxide Tftsmentioning

confidence: 97%

Printable Semiconductors for Backplane TFTs of Flexible OLED Displays

Zhu

Shin

Liu

et al. 2019

Adv Funct Materials

168

130

View full text Add to dashboard Cite

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“…The low areal capacitance could be ascribed to the thicker Al 2 O 3 layer ( d = 100 nm), incurring large operating TFT voltage at the same time. Besides specific choose of solute and solvent, environmental humidity during coating (<20%) is particularly important to obtain uniform WI oxide films …”

Section: Low Temperature Routes For Flexible and Printed High κ Oxidementioning

confidence: 99%

Solution Processed Metal Oxide High‐κ Dielectrics for Emerging Transistors and Circuits

et al. 2018

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The electronic functionalities of metal oxides comprise conductors, semiconductors, and insulators. Metal oxides have attracted great interest for construction of large-area electronics, particularly thin-film transistors (TFTs), for their high optical transparency, excellent chemical and thermal stability, and mechanical tolerance. High-permittivity (κ) oxide dielectrics are a key component for achieving low-voltage and high-performance TFTs. With the expanding integration of complementary metal oxide semiconductor transistors, the replacement of SiO with high-κ oxide dielectrics has become urgently required, because their provided thicker layers suppress quantum mechanical tunneling. Toward low-cost devices, tremendous efforts have been devoted to vacuum-free, solution processable fabrication, such as spin coating, spray pyrolysis, and printing techniques. This review focuses on recent progress in solution processed high-κ oxide dielectrics and their applications to emerging TFTs. First, the history, basics, theories, and leakage current mechanisms of high-κ oxide dielectrics are presented, and the underlying mechanism for mobility enhancement over conventional SiO is outlined. Recent achievements of solution-processed high-κ oxide materials and their applications in TFTs are summarized and traditional coating methods and emerging printing techniques are introduced. Finally, low temperature approaches, e.g., ecofriendly water-induced, self-combustion reaction, and energy-assisted post treatments, for the realization of flexible electronics and circuits are discussed.

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“…We ascribe the variability to fluctuations in the humidity of the laboratory during the film preparation (see Supplementary Fig. 9), which is a parameter affecting the spin-coating deposition from aqueous solutions 56,57 . The variability of the thickness of samples prepared on the same day from the same solution is 4%, while a systematic deviation between the thicknesses from the two solutions of 5% was found.…”

Section: % Rhmentioning

confidence: 99%

One-step procedure for the preparation of functional polysaccharide/fatty acid multilayered coatings

Micciulla

Hayward

Gerelli³

et al. 2019

Commun Chem

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Soft, stratified, amphiphilic systems are recurrent motifs in nature, e.g., in myelin sheaths or thylakoid stacks, and synthetic analogues are increasingly being exploited in the areas of biocatalysis, biosensing, and drug delivery. The synthesis of such complex multilayered systems usually requires lengthy preparation protocols. Here, we demonstrate the formation of multilayered fatty acid/polysaccharide thin films prepared via a single step protocol, which exploits the spontaneous self-assembly of the components into vesicular systems in aqueous solution. The solutions are characterized by light and neutron scattering experiments and the thin films by neutron reflectometry, optical ellipsometry, atomic force microscopy, and x-ray diffraction. The thin films exhibit structural features with sub-10 nm dimensions, stemming from the ordered sequence of hydrophilic and hydrophobic layers and respond strongly to changes in ambient humidity. Using this approach, films with a total thickness varying from tens to hundreds of nanometers can be easily prepared.

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Impact of Relative Humidity during Spin-Deposition of Metal Oxide Thin Films from Aqueous Solution Precursors

Cited by 26 publications

References 40 publications

Printable Semiconductors for Backplane TFTs of Flexible OLED Displays

Printable Semiconductors for Backplane TFTs of Flexible OLED Displays

Solution Processed Metal Oxide High‐κ Dielectrics for Emerging Transistors and Circuits

One-step procedure for the preparation of functional polysaccharide/fatty acid multilayered coatings

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