Structural Rearrangement of Organic Semiconductor Molecules with an Asymmetric Shape in Thin Films
Structural Rearrangement of Organic Semiconductor Molecules with an Asymmetric Shape in Thin Films
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薄膜中不对称形状有机半导体分子的结构重排
DOI：
10.1021/acs.jpcc.3c01003
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Hasegawa Takeshi
中科院分区：
文献类型：
--
作者：
Oka Takayuki;Shioya Nobutaka;Shimoaka Takafumi;Hasegawa Takeshi
2-癸基-7-苯基[1]苯并噻吩并[3，2-B][1]苯并噻吩（Ph-BTBT-C10）作为有机薄膜晶体管中的活性层表现出优异的性能，结晶多晶型物。该化合物在气相沉积膜中具有所谓的薄膜相，其不同于单晶结构（体相）。采用旋涂法制备了Ph-BTBT-C10薄膜，并利用高分辨红外光谱和X射线衍射研究了老化对薄膜结构的影响。结果表明，旋成膜具有与气相沉积膜相同的薄膜相，并且在室温下通过老化，薄膜相迅速转变为体相。此外，光谱分析还揭示了结晶转变过程中癸基链的构象变化。这项工作突出了使用高波数分辨率的红外光谱的分子薄膜的结构分析的重要性。
2-Decyl-7-phenyl[1]benzothieno[3,2-b][1]benzothiophene (Ph-BTBT-C10) exhibits excellent performances as an active layer in organic thin-film transistors, and its performances are greatly influenced by the molecular packing, i.e., the crystalline polymorphs. This compound has the so-called thin-film phase in a vapor-deposited film, which is different from the single-crystal structure (the bulk phase). In this work, thin films of Ph-BTBT-C10are prepared by spin coating, and the effect of aging on the film structure is investigated by high-resolution infrared (IR) spectroscopy in combination with X-ray diffraction. The results show that the as-spun film has the same thin-film phase as the vapor-deposited film and that the thin-film phase is rapidly converted to the bulk phase by aging at room temperature. In addition, the spectral analysis also reveals conformational changes in the decyl chain during the crystalline transition process. This work highlights the importance of using IR spectroscopy with a high-wavenumber resolution for structural analysis of molecular thin films.
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