57‐1: <i>Invited Paper</i>: Ink‐Jet‐Printed OLED Displays

Böhm, Edgar; Levermore, Peter A.; Tseng, Hsin‐Rong; Béalle, Gaëlle; Wang, Hsing-Ju; Hibon, Pauline; Heil, Holger; Jatsch, Anja; Buchholz, Herwig

doi:10.1002/sdtp.11783

Cited by 16 publications

(8 citation statements)

References 3 publications

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“…[21,22] Currently, the organic materials are patterned using a shadow mask, known as a finemetal mask (FMM), whose quality, durability, and availability over large areas currently places a major bottleneck on the next generation of device production. The most significant commercial success of organic semiconductors has come in the form of displays made from organic light emitting diodes (OLEDs).…”

Section: Introductionmentioning

confidence: 99%

“…Although the current generation of this OLED technology (focusing on smaller-area displays used in smartphones) utilizes evaporation to deposit the organic materials, there is significant interest in this branch to utilize coating and printing technologies in future generations of optoelectronic products in order to reduce material wastage and enable the production of largerarea true multi color pixel devices. [21,22] Currently, the organic materials are patterned using a shadow mask, known as a finemetal mask (FMM), whose quality, durability, and availability over large areas currently places a major bottleneck on the next generation of device production. [21] A great deal of expertise has been generated using inkjet printing in this field, with industrial players, including Kateeva, Inc., actively contributing to its rapid further development.…”

Section: Introductionmentioning

confidence: 99%

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Coated and Printed Perovskites for Photovoltaic Applications

et al. 2019

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optoelectronic devices, a novel lowcost and highly efficient photovoltaic (PV) material emerged. Only 10 years after the first reported perovskite solar cells (PSCs), power conversion efficiencies (PCEs) above 23% were certified, exceeding those of much longer established thin-film PV technologies, including organic photovoltaics (OPV) and inorganic thin-film PV based on copper indium gallium selenide (CIGS) or cadmium telluride (CdTe). [1] The material class of hybrid organic-inorganic perovskites combines excellent optoelectronic properties, such as long diffusion lengths [2] and short absorption lengths, [3] with the ease of solution processing, low energy payback times, and low-cost precursor materials. [4] Moreover, the optoelectronic properties and the material stability can be engineered by varying the constituents in the perovskite crystal structure ABX 3 . For example, the bandgap (E G ) can be tuned by changing the stoichiometric ratio of Br and I at the halogen anion site X. [5][6][7] In order to improve the stability of hybrid organic-inorganic perovskites, compositional engineering of the cation site A was demonstrated to be successful via combining methylammonium (CH 3 NH 3 + or MA + ), formamidinium (CH 5 N 2 + or FA + ), Cs + , and Rb + ions in the so-called multi-cation perovskites. [8][9][10][11] Three key challenges hinder today the economical breakthrough of PSCs:Stability: First, the instability of PSCs against moisture, oxygen, light, and temperature limits the lifetime of PSCs to a fraction of the warranty lifetime (often >25 years) of the market dominating crystalline silicon (c-Si) PV. [12] Very respectable progress has been made over recent years to enhance the stability of PSCs by demonstrating stability over 1000 h, but significant further advances in terms of stability are needed to lift the technology to a level where it is ready to compete with, or be a bolt-on tandem companion to the current PV heavyweight of c-Si. A number of reviews cover recent developments on the topic of stability. [13][14][15][16][17] Toxicity: Second, highly efficient PSCs still contain lead, the toxicity of which hampers the acceptance of the technology and could conflict with legislative barriers. [18] Other recent reviews present progress with respect to this challenge. [19,20] Upscaling: Third, the upscaling of perovskite PV devices to commercial PV module sizes (>1 m 2 ) must be achieved. To date, the vast majority of research and development of PSCs is still Hybrid organic-inorganic metal halide perovskite semiconductors provide opportunities and challenges for the fabrication of low-cost thin-film photovoltaic devices. The opportunities are clear: the power conversion efficiency (PCE) of small-area perovskite photovoltaics has surpassed many established thin-film technologies. However, the large-scale solution-based deposition of perovskite layers introduces challenges. To form perovskite layers, precursor solutions are coated or printed and these must then be crystallized into the perovskite structur...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coated and Printed Perovskites for Photovoltaic Applications

et al. 2019

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“…[ 14 ] An exemplary application for this technology is displays with inkjet‐printed oxide TFT backplanes coupled with inkjet‐printed organic light‐emitting diode frontplanes. [ 15,16 ]…”

Section: Introductionmentioning

confidence: 99%

Inkjet‐Printed Ternary Oxide Dielectric and Doped Interface Layer for Metal‐Oxide Thin‐Film Transistors with Low Voltage Operation

Gillan

Lahtinen

et al. 2021

Adv Materials Inter

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Additive solution process patterning, such as inkjet printing, is desirable for high‐throughput roll‐to‐roll and sheet fabrication environments of electronics manufacturing because it can help to reduce cost by conserving active materials and circumventing multistep processing. This paper reports inkjet printing of YxAl2−xO3 gate dielectric, In2O3 semiconductor, and a polyethyleneimine‐doped In2O3 interfacial charge injection layer to achieve a thin‐film transistor (TFT) mobility (μsat) of ≈1 cm2 V−1 s−1 at a low 3 V operating voltage. When the dielectric material is annealed at 350 °C, plasma treatment induces low‐frequency capacitance instability, leading to overestimation of mobility. On the contrary, films annealed at 500 °C show stable capacitance from 1 MHz down to 0.1 Hz. This result highlights the importance of low‐frequency capacitance characterization of solution‐processed dielectrics, especially if plasma treatment is applied before subsequent processing steps. This study progresses metal‐oxide TFT fabrication toward fully inkjet‐printed thin‐film electronics.

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“…Currently, commercial OLEDs are made of multilayer devices with varied functional layers acting as charge injection, charge transport, exciton blocking, and emitting layers (EMLs)... For IJP OLEDs, which is one kind of the solution-processed OLEDs, a major issue is intermixing of layers due to the deposition of a layer may dissolve or intermix with the preceding layer [4][5]. Enormous efforts have been made to overcome this issue, including the use of orthogonal solvent systems, photo or thermal cross-linkable organic functional materials... [4] Until now, the hole injection layer (HIL), the hole transport layer (HTL) and the emission layer (EML) can be well fabricated by IJP process and high performance IJP OLEDs can be achieved [6][7]. However, it is still a big challenge to fabricate the electronic transport layer (ETL) by IJP process.…”

Section: Introductionmentioning

confidence: 99%

80‐3: All Organic Layers Inkjet Printed OLEDs with a Printable Electronic Transport Layer

Wang

Wu²,

Jiao³

et al. 2019

Symp Digest of Tech Papers

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All organic layers inkjet printed OLEDs have been successfully developed with a printable electronic transport layer (ETL). A jettable ETL ink was prepared with a commercially soluble electronic transport material and alcohol solvents. Based on orthogonal solvent systems, the deposition of ETL caused little damage to the emission under-layer. And ETL printed OLEDs show comparable performance with its evaporation ETL counterparts.

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57‐1: Invited Paper: Ink‐Jet‐Printed OLED Displays

Cited by 16 publications

References 3 publications

Coated and Printed Perovskites for Photovoltaic Applications

Coated and Printed Perovskites for Photovoltaic Applications

Inkjet‐Printed Ternary Oxide Dielectric and Doped Interface Layer for Metal‐Oxide Thin‐Film Transistors with Low Voltage Operation

80‐3: All Organic Layers Inkjet Printed OLEDs with a Printable Electronic Transport Layer

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