We prepared titanyl phthalocyanine (TiOPc) monolayers on sapphire-prism supported Au{111} substrates through solution deposition and characterized their photoresponses using a custom-built laser-assisted scanning tunneling microscope under ambient conditions. Two types of lattice structures (hexagonal and rectangular) were observed, and the distributions of photoinduced charges were measured under evanescently introduced 633 and 780 nm laser illumination. The distributions of photoexcited electrons in molecules in hexagonal lattices match theoretically calculated charge density changes in TiOPc molecules upon excitation. However, the photoresponses of TiOPc molecules in rectangular lattices are different than those predicted and TiOPc molecules in these arrangements may have lower excitation probabilities at 633 and 780 nm. Our results suggest that the photocarrier generation efficiency of TiOPc molecules is related to their packing arrangements in monolayers and local environments. The growth mechanisms of the monolayers and their connections to different polymorphs of TiOPc are worth to be further explored so that the photogenerated electronic property changes that we observed at the molecular level can provide more accurate guidance to the application of TiOPc crystals and assemblies.

中文翻译：

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溶液沉积的钛基酞菁单分子膜中的光诱导载流子产生和分布

我们通过溶液沉积在蓝宝石棱镜支撑的Au {111}衬底上制备了钛氧基酞菁（TiOPc）单层，并使用定制的激光辅助扫描隧道显微镜在环境条件下表征了它们的光响应。观察到两种类型的晶格结构（六边形和矩形），并在e逝的633和780 nm激光照射下测量了光诱导电荷的分布。六角形晶格中分子中光激发电子的分布与理论计算得出的TiOPc分子在激发时的电荷密度变化相匹配。但是，矩形晶格中的TiOPc分子的光响应与预测的不同，并且在这些排列中的TiOPc分子在633和780 nm处可能具有较低的激发概率。我们的结果表明，TiOPc分子的光载流子产生效率与其在单层和局部环境中的堆积安排有关。值得进一步探索单层的生长机理及其与TiOPc不同多晶型物的联系，以便我们在分子水平上观察到的光生电子性质变化可以为TiOPc晶体和组件的应用提供更准确的指导。