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  1. Artikel: Leveling up Organic Semiconductors with Crystal Twisting.

    Whittaker, St John / Zhou, Hengyu / Spencer, Rochelle B / Yang, Yongfan / Tiwari, Akash / Bendesky, Justin / McDowell, Merritt / Sundaram, Pallavi / Lozano, Idalys / Kim, Shin / An, Zhihua / Shtukenberg, Alexander G / Kahr, Bart / Lee, Stephanie S

    Crystal growth & design

    2023  Band 24, Heft 2, Seite(n) 613–626

    Abstract: The performance of crystalline organic semiconductors depends on the solid-state structure, especially the orientation of the conjugated components with respect to device platforms. Often, crystals can be engineered by modifying chromophore substituents ... ...

    Abstract The performance of crystalline organic semiconductors depends on the solid-state structure, especially the orientation of the conjugated components with respect to device platforms. Often, crystals can be engineered by modifying chromophore substituents through synthesis. Meanwhile, dissymetry is necessary for high-tech applications like chiral sensing, optical telecommunications, and data storage. The synthesis of dissymmetric molecules is a labor-intensive exercise that might be undermined because common processing methods offer little control over orientation. Crystal twisting has emerged as a generalizable method for processing organic semiconductors and offers unique advantages, such as patterning of physical and chemical properties and chirality that arises from mesoscale twisting. The precession of crystal orientations can enrich performance because achiral molecules in achiral space groups suddenly become candidates for the aforementioned technologies that require dissymetry.
    Sprache Englisch
    Erscheinungsdatum 2023-11-14
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Review
    ISSN 1528-7483
    ISSN 1528-7483
    DOI 10.1021/acs.cgd.3c01072
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Collimating the growth of twisted crystals of achiral compounds.

    Lozano, Idalys / Whittaker, St John / Yang, Yongfan / Tiwari, Akash / Zhou, Hengyu / Kim, Shin / Mendoza, Magaly / Sow, Maryam / Shtukenberg, Alexander G / Kahr, Bart / An, Zhihua / Lee, Stephanie S

    Chirality

    2023  Band 35, Heft 7, Seite(n) 418–426

    Abstract: A great proportion of molecular crystals can be made to grow as twisted fibrils. Typically, this requires high crystallization driving forces that lead to spherulitic textures. Here, it is shown how micron size channels fabricated from poly( ... ...

    Abstract A great proportion of molecular crystals can be made to grow as twisted fibrils. Typically, this requires high crystallization driving forces that lead to spherulitic textures. Here, it is shown how micron size channels fabricated from poly(dimethylsiloxane) (PDMS) serve to collimate the circular polycrystalline growth fronts of optically banded spherulites of twisted crystals of three compounds, coumarin, 2,5-bis(3-dodecyl-2-thienyl)-thiazolo[5,4-d]thiazole, and tetrathiafulvalene. The relationships between helicoidal pitch, growth front coherence, and channel width are measured. As channels spill into open spaces, collimated crystals "diffract" via small angle branching. On the other hand, crystals grown together from separate channels whose bands are out of phase ultimately become a single in-phase bundle of fibrils by a cooperative mechanism yet unknown. The isolation of a single twist sense in individual channels is described. We forecast that such chiral molecular crystalline channels may function as chiral optical wave guides.
    Sprache Englisch
    Erscheinungsdatum 2023-03-18
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 1011639-4
    ISSN 1520-636X ; 0899-0042
    ISSN (online) 1520-636X
    ISSN 0899-0042
    DOI 10.1002/chir.23558
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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