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@ARTICLE{Li:642217,
      author       = {Li, Zhuoqing and Sentker, Kathrin and Brinker, Manuel and
                      Lippmann, Milena and Seeck, Oliver H. and Kityk, Andriy V.
                      and Ocko, Ben and Huber, Patrick},
      title        = {{C}ontrolling {O}rganic {S}emiconductor {S}elf-{A}ssembly
                      through {C}ylindrical {N}anoconfinement},
      journal      = {ChemRxiv},
      reportid     = {PUBDB-2025-05413},
      year         = {2025},
      abstract     = {Controlling the self-assembly of organic semiconductors at
                      the nanoscale is critical for advancing high-performance
                      electronic and photonic devices, yet remains challenging due
                      to their intrinsic anisotropic crystallization and
                      sensitivity to processing conditions. Here, we demonstrate
                      that cylindrical nanoconfinement within anodic aluminum
                      oxide membranes provides a versatile platform to precisely
                      tune the molecular orientation and phase behavior of the
                      prototypical organic semiconductor
                      2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene
                      (C8-BTBT-C8). Combining temperature-dependent
                      high-resolution synchrotron X-ray scattering with optical
                      birefringence measurements, we uncover that confinement
                      geometries (pore diameters 25–180 nm) and surface
                      chemistry govern the emergence of distinct smectic A
                      textures, featuring molecular layers either parallel or
                      perpendicular to the pore axis. The competition between
                      axial and radial smectic layering is modulated by pore size,
                      surface hydrophilicity, and thermal history, enabling
                      reversible control over domain orientations and transitions
                      between liquid crystalline and crystalline states. Notably,
                      nanoconfinement stabilizes the smectic phase over an
                      expanded temperature range compared to bulk, while inducing
                      complex multi-domain configurations owing to geometric
                      constraints and anchoring conditions. Our results elucidate
                      fundamental mechanisms by which anisotropic nanoscale
                      confinement directs the self-organization of highly
                      conjugated organic molecules, with implications for
                      optimizing directional charge transport and anisotropic
                      optical responses in organic–inorganic hybrid
                      nanoarchitectures. This study establishes nanoconfinement as
                      a powerful strategy to engineer morphology and functional
                      properties in organic semiconducting materials with
                      nanoscale precision.},
      cin          = {CIMMS},
      cid          = {I:(DE-H253)CIMMS-20211022},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-H253)P-P08-20150101},
      typ          = {PUB:(DE-HGF)25},
      doi          = {10.26434/chemrxiv-2025-rzjg4},
      url          = {https://bib-pubdb1.desy.de/record/642217},
}