Precursor Film Growth of 2,7-Dioctyl[1]benzothieno[3,2-<i>b</i>][1]benzothiophene (C8-BTBT) in the Smectic a Liquid Crystal Phase for High-Performance Transistor Applications.

ABSTRACT: We present an approach to fabricating ultrathin organic semiconductor films via the smectic A liquid crystal precursor films of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) formed on Si and SiO₂/Si substrates. Using phase-shifting imaging ellipsometry, we directly visualize the lateral spread of the precursor films in discrete monolayer terraces from the reservoir region, where each layer exhibits diffusive growth behavior. Additional X-ray reflectivity measurements confirm that these monolayers adopt a standing molecular orientation. We find that the first layer grows with an apparent diffusion coefficient (D) of the order of 10^-9 m² s^-1 at 115 °C, whereas the second layer grows more slowly. The substrate surface con

SUBMITTER: Tsujita K 

PROVIDER: S-EPMC12368989 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature