Open AccessTransient phases during fast crystallization of organic thin films from solution
Author(s) -
Jing Wan,
Yang Li,
Jeffrey G. Ulbrandt,
DetlefM. Smilgies,
Jonathan Hollin,
Adam C. Whalley,
Randall L. Headrick
Publication year - 2016
Publication title -
apl materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.571
H-Index - 60
ISSN - 2166-532X
DOI - 10.1063/1.4939464
Subject(s) - materials science , crystallization , benzothiophene , thin film , organic semiconductor , microbeam , phase (matter) , chemical engineering , amorphous solid , substrate (aquarium) , layer (electronics) , transient (computer programming) , scattering , deposition (geology) , analytical chemistry (journal) , crystallography , optoelectronics , optics , composite material , nanotechnology , organic chemistry , thiophene , chemistry , oceanography , computer science , engineering , operating system , paleontology , physics , sediment , geology , biology
We report an in situ microbeam grazing incidence X-ray scattering study of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) organic semiconductor thin film deposition by hollow pen writing. Multiple transient phases are observed during the crystallization for substrate temperatures up to ≈93 °C. The layered smectic liquid-crystalline phase of C8-BTBT initially forms and preceedes inter-layer ordering, followed by a transient crystalline phase for temperature >60 °C, and ultimately the stable phase. Based on these results, we demonstrate a method to produce extremely large grain size and high carrier mobility during high-speed processing. For high writing speed (25 mm/s), mobility up to 3.0 cm2/V-s has been observed
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