Substrate-Independent Control of Polymorphs in Tetraphenylporphyrin Thin Films by Varying the Solvent Evaporation Time Using a Simple Spin-Coating Technique
Substrate-Independent Control of Polymorphs in Tetraphenylporphyrin Thin Films by Varying the Solvent Evaporation Time Using a Simple Spin-Coating Technique
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DOI：
10.1021/acs.cgd.1c00500
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发表时间：
2021-07
影响因子：
3.8
通讯作者：
Kazutaka Tomita;Nobutaka Shioya;Takafumi Shimoaka;K. Okudaira;Hiroyuki Yoshida;T. Koganezawa;T. Hasegawa
中科院分区：
文献类型：
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作者：
Kazutaka Tomita;Nobutaka Shioya;Takafumi Shimoaka;K. Okudaira;Hiroyuki Yoshida;T. Koganezawa;T. Hasegawa
卟啉衍生物是用于各种薄膜基器件如太阳能电池、场效应晶体管和气体传感器的有前途的材料。由于薄膜中的分子聚集结构显著影响器件性能，因此控制聚集结构至关重要。在这项研究中，我们表明，三种不同的结晶多晶型物的游离碱四苯基卟啉（H2TPP）可以形成旋涂薄膜取决于溶剂的蒸发时间。结果表明，溶剂蒸发时间控制着薄膜的聚集态结构，而初始薄膜结构决定了热退火后薄膜的晶型。
Porphyrin derivatives are promising materials for various thin-film-based devices such as solar cells, field-effect transistors, and gas sensors. Since the molecular aggregation structure in a thin film significantly influences the device performance, controlling the aggregation structure is of crucial importance. In this study, we show that three different crystalline polymorphs of free-base tetraphenylporphyrin (H2TPP) can be made to form in spin-coated thin films depending on the evaporation time of the solvent. The results show that the aggregation structure in the as-spun films is controlled by the solvent evaporation time, and the initial film structure determines the polymorphs obtained after thermal annealing.