Quantitative Determination of Charge Transport Interface at Vertically Phase Separated Soluble Acene/Polymer Blends

Lee, Jung Hun; Lyu, Jaegeun; Kim, Minsong; Ahn, Hyungju; Lim, Soohwan; Jang, Ho Won; Chung, Hyun‐Jong; Lee, June Hyuk; Koo, Jaseung; Lee, Wi Hyoung

doi:10.1002/adfm.202215221

Cited by 5 publications

References 41 publications

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Insulating Electrets Converted from Organic Semiconductor for High‐Performance Transistors, Memories, and Artificial Synapses

Li,

An,

Tan

et al. 2023

Adv Funct Materials

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Electrets are commonly used charged insulators that generate a quasi‐permanent electric field. However, when conventional electrets come into direct contact with semiconductors, the energy level mismatch at the interface results in low memory speed and high energy consumption of electret devices due to both charge injection and storage being non‐conducive. To address this, the n‐type semiconductor N,N′‐dioctyl‐3,4,9,10‐perylene tetracarboxylic diimide (C8‐PTCDI) is converted to C8‐PTCDI (D) via oxygen degradation. The resulting C8‐PTCDI (D) electrets, when charged using an electric field and/or light, retain the energy level of the n‐type semiconductors to facilitate charge trapping. They also exhibit deeper trap energy levels and increased trap density, thereby enhancing the sheet charge density of C8‐PTCDI (D) electrets (7.47 × 1012 cm−2). As a result, devices based on n‐type electrets demonstrate lower operation voltage (2 V) of transistors, lower operation voltage (20 V) of memories, and lower energy consumption (3.5 fJ per spike) of artificial synapses compared to those without n‐type electrets.

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Insulating Electrets Converted from Organic Semiconductor for High‐Performance Transistors, Memories, and Artificial Synapses

Li,

An,

Tan

et al. 2023

Adv Funct Materials

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Deuteration‐Induced Superior Properties in Polymer/Soluble Acene Blends: A Comprehensive Study

Lee,

Lim,

Kim

et al. 2024

Adv Funct Materials

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The selection of suitable polymers is pivotal in influencing the electrical performance and the thermal/electrical stabilities of organic electronics. Here, the superior properties induced by deuteration in polymer/2,8‐difluoro‐5,11‐bis(triethylsilylethynyl)anthradithiophene (diF‐TES ADT) blends are systematically investigated. By employing a combination of experimental and computational analyses, the critical factors underlying charge transport and device stabilities in deuterated polymers (d‐polymers) compared to protonated polymers are elucidated. Deuterated polymers exhibit increased mass due to the substitution of hydrogen with deuterium, reducing the zero‐point vibration energy by 1/√2. This reduction leads to enhanced energetic stabilization and the formation of stronger D─C bonds than H─C bonds. Consequently, deuterated polymers exhibit enhanced thermal properties, along with improved insulating properties, which are intrinsically linked to improved device performance. Additionally, the correlation between the electrical properties and bias stability using deuterated poly(methyl methacrylate) (d‐PMMA) and polystyrene (d‐PS) blends are analyzed. Utilizing complementary neutron & X‐ray reflectivity, and photoexcited charge‐collection spectroscopy (PECCS), phase separation and trap dynamics are delved, providing a comprehensive understanding of these relationships. These findings reveal that d‐polymers significantly enhance the electrical performance and stability of the blends, offering valuable insights for the design of advanced materials in organic electronics.

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Crystal Engineering Under Residual Solvent Evaporation: A Journey Into Crystallization Chronicles of Soluble Acenes

Lee,

Anthony

et al. 2024

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In the pursuit of achieving high‐performance and high‐throughput organic transistors, this study highlights two critical aspects: designing new soluble acenes and optimizing their solution processing. A fundamental understanding of the crystallization mechanism inherent to these customized soluble acenes, as they undergo a transformation during the evaporation of residual solvent, is deemed essential. Here, the pathway to crafting ideal solution processing conditions is elucidated, meticulously tailored to the molecular structure of soluble acenes when blended with polymers. Employing a comprehensive array of analytical and computational methodologies, this investigation delves directly into the intricate interplay between processing parameters and crystallization mechanisms, firmly rooted in the domains of thermodynamics and kinetics. Notably, a delicate equilibrium where the optimal weight of residual solvent harmoniously aligns is uncovered with the specific attributes of soluble acene molecules, exerting influence over vertical phase separation with the blended polymer and the crystallization process of soluble acenes at the surface. Consequently, transistors showcasing remarkable field‐effect mobility exceeding 8 cm2 V−1 s−1 are successfully developed. These findings provide invaluable guidance for navigating the path toward determining optimal solution processing conditions across a diverse array of soluble acene/polymer blend systems, all achieved through the strategic application of crystal and residual solvent engineering.

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Quantitative Determination of Charge Transport Interface at Vertically Phase Separated Soluble Acene/Polymer Blends

Cited by 5 publications

References 41 publications

Insulating Electrets Converted from Organic Semiconductor for High‐Performance Transistors, Memories, and Artificial Synapses

Insulating Electrets Converted from Organic Semiconductor for High‐Performance Transistors, Memories, and Artificial Synapses

Deuteration‐Induced Superior Properties in Polymer/Soluble Acene Blends: A Comprehensive Study

Crystal Engineering Under Residual Solvent Evaporation: A Journey Into Crystallization Chronicles of Soluble Acenes

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