Publications by authors named "Craig P Yu"

Open-shell systems with extensive π-conjugation have fascinating properties due to their narrow bandgaps and spin interactions. In this work, we report neutral open-shell di- and polyradical conjugated materials exhibiting intriguing optical and magnetic properties. Our key design advance is the planarized geometry allowing for greater interaction between adjacent spins.

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Lithium-sulfur (Li-S) batteries are a promising high-energy-density technology for next-generation energy storage but suffer from an inadequate lifespan. The poor cycle life of Li-S batteries stems from their commonly adopted catholyte-mediated operating mechanism, where the shuttling of dissolved polysulfides results in active material loss on the sulfur cathode and surface corrosion on the lithium anode. Here, we report formation of a quasi-solid-state electrolyte (QSSE) on the metallic 1T phase molybdenum disulfide (MoS) host that extends the lifetime of Li-S batteries.

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Triphenylmethyl (trityl) radicals have shown potential for use in organic optoelectronic applications, but the design of practical trityl structures has been limited to donor/radical charge-transfer systems due to the poor luminescence of alternant symmetry hydrocarbons. Here, we circumvent the symmetry-forbidden transition of alternant hydrocarbons via excited-state symmetry breaking in a series of phenyl-substituted tris(2,4,6-trichlorophenyl)methyl (TTM) radicals. We show that 3-fold phenyl substitution enhances the emission of the TTM radical and that steric control modulates the optical properties in these systems.

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Article Synopsis
  • * The study introduces a new approach using an asymmetric molecular design with alkyl chains to enhance the solubility and processing of a promising OSC, PhC-BQQDI, while maintaining its high electron mobility.
  • * The new compound, PhC-BQQDI-C, shows exceptional electron mobility and can create larger continuous thin films, opening avenues for better understanding electron transport properties and electronics applications.
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Synthetically versatile electron-deficient π-electron systems are urgently needed for organic electronics, yet their design and synthesis are challenging due to the low reactivity from large electron affinities. In this work, we report a benzo[de]isoquinolino[1,8-gh]quinoline diamide (BQQDA) π-electron system. The electron-rich condensed amide as opposed to the generally-employed imide provides a suitable electronic feature for chemical versatility to tailor the BQQDA π-electron system for various electronic applications.

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Article Synopsis
  • The research highlights the role of higher occupied molecular orbitals (HOMO, SHOMO, and THOMO) in enhancing charge transport in organic semiconductors, which is typically dominated by HOMO overlaps.
  • It introduces a novel N-shaped organic compound, BNTP, designed to improve charge transport by utilizing mixed-orbital electronic couplings through the addition of a pyrazine component.
  • The findings show that the engineered BNTP, particularly its decylphenyl-substituted variant (CPh-BNTP), achieves significant hole mobility (up to 9.6 cm V s) in organic field-effect transistors, demonstrating the importance of considering multiple orbitals for better semiconducting properties.
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Article Synopsis
  • - Organic semiconductors (OSCs), important for flexible electronic devices, are being studied across various fields but face challenges due to their lower carrier mobilities compared to traditional silicon-based devices.
  • - One major focus is on organic thin-film transistors (OTFTs), particularly n-type OSCs, which struggle with carrier mobility and stability due to their structural properties compared to more stable p-type OSCs.
  • - Recent research emphasizes the importance of molecular design and structural arrangements in enhancing the performance of n-type OSCs, with a new development involving a specific π-electron core structure that incorporates electronegative nitrogen atoms to improve electronic properties.
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Benzo[de]isoquinolino[1,8-gh]quinolinetetracarboxylic diimide (BQQDI) is an n-type organic semiconductor that has shown unique multi-fold intermolecular hydrogen-bonding interactions, leading to aggregated structures with excellent charge transports and electron mobility properties. However, the strong intermolecular anchoring of BQQDI presents challenges for fine-tuning the molecular assembly and improving the semiconducting properties. Herein, we report the design and synthesis of two BQQDI derivatives with phenyl- and cyclohexyl substituents (Ph-BQQDI and Cy-BQQDI), where the two organic semiconductors show distinct molecular assemblies and degrees of intermolecular orbital overlaps.

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Operational stability, such as long-term ambient durability and bias stress stability, is one of the most significant parameters in organic thin-film transistors (OTFTs). The understanding of such stabilities has been mainly devoted to energy levels of frontier orbitals, thin-film morphologies, and device configuration involving gate dielectrics and electrodes, whereas the roles of molecular and aggregated structural features in device stability are seldom discussed. In this Letter, we report a remarkable enhancement of operational stability, especially bias stress, of n-channel single-crystal OTFTs derived from a replacement of phenyl with perfluorophenyl groups in the side chain.

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Toward the development of high-performance organic semiconductors (OSCs), carrier mobility is the most important requirement for next-generation OSC-based electronics. The strategy is that OSCs consisting of a highly extended π-electron core exhibit two-dimensional (2D) aggregated structures to offer effective charge transport. However, such OSCs, in general, show poor solubility in common organic solvents, resulting in limited solution processability.

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Significant progress has been made in both molecular design and fundamental scientific understanding of organic semiconductors (OSCs) in recent years. Suitable charge-carrier mobilities (μ) have been obtained by many high-performance OSCs (μ > 10 cm V s), but drawbacks remain, including low solution processability and poor thermal durability. In addition, since aggregation of OSCs involves weak intermolecular interactions, the molecules are perpetually in thermal motion, even in the solid state, which disrupts charge-carrier transport.

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The solvation-dependent excited state dynamics of two push-pull fluorophores with donor-π-acceptor (D-π-A) structures were investigated using steady-state and ultrafast transient absorption (TA) spectroscopy, backed by theoretical calculations. Identical D and A groups were present in both dyes, which differed only in the structure of their central π-conjugated linkers. Dye 1 features a p-phenylenediethynyl linker, while dye 2 contains a 2,5-diethynylthiophene linker.

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In this paper, the molecular design of the first deep-lowest unoccupied molecular orbital (LUMO) level diimide π-electron core, benzo[ c]thiophene diimide (BTDI), as a novel n-type organic semiconductor was determined. An original synthetic sequence was devised to obtain the target cyclohexyl-BTDI (Cy-BTDI) derivative. Cy-BTDI demonstrated completely reversible reduction waves and a stable radical anionic state.

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A new class of push-pull fluorophores featuring the pentafluorosulfanyl (SF) group as a potent acceptor has been synthesized. Known for its excellent chemical and thermal stability, the unique SF functionality is also strongly electron-withdrawing but at the same time highly lipophilic. We report six new fluorescent dyes, which were characterized by UV-vis/fluorescence spectroscopy, single-crystal X-ray diffraction, and cyclic voltammetry.

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A deep-blue-emitting sultam-based hetero[5]helicene was synthesized in four steps, and its crystal structure and physical properties were characterized. The helicene displays more than two-fold crystallization-induced emission enhancement as well as atypical blue-shifting of its solid-state emission relative to the solution phase. This rapid synthesis of an unusual sulfonamide-based helicene fluorophore is expected to generate new molecular design options that will help address the ongoing challenges associated with designing pure-blue emitters for organic optoelectronic and sensing applications.

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