Sy Piecco Kurt Waldo E, Vicente Juvinch R, Pyle Joseph R, Ingram David C, Kordesch Martin E, Chen Jixin
Department of Chemistry and Biochemistry, Ohio University, Athens, OH 45701, USA.
Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, OH 45701, USA.
ACS Appl Electron Mater. 2019 Nov 26;1(11):2279-2286. doi: 10.1021/acsaelm.9b00475. Epub 2019 Oct 16.
Patterning semiconducting materials are important for many applications such as microelectronics, displays, and photodetectors. Lead halide perovskites are an emerging class of semiconducting materials that can be patterned via solution-based methods. Here we report an all-benchtop patterning strategy by first generating a patterned surface with contrasting wettabilities to organic solvents that have been used in the perovskite precursor solution then spin-coating the solution onto the patterned surface. The precursor solution only stays in the area with higher affinity (wettability). We applied sequential sunlight-initiated thiol-ene reactions to functionalize (and pattern) both glass and conductive fluorine-doped tin oxide (FTO) transparent glass surfaces. The functionalized surfaces were measured with the solvent contact angles of water and different organic solvents and were further characterized by XPS, selective fluorescence staining, and selective DNA adsorption. By simply spin-coating and baking the perovskite precursor solution on the patterned substrates, we obtained perovskite thin-film microarrays. The spin-coated perovskite arrays were characterized by XRD, AFM, and SEM. We concluded that patterned substrate prepared via sequential sunlight-initiated thiol-ene click reactions is suitable to fabricate perovskite arrays via the benchtop process. In addition, the same patterned substrates can be reused several times until a favorable perovskite microarray is acquired. Among a few conditions we have tested, DMSO solvent and modified FTO surfaces with alternatively carboxylic acid and alkane is the best combination to obtain high-quality perovskite microarrays. The solvent contact angle of DMSO on carboxylic acid-modified FTO surface is nearly zero and 65±3° on octadecane modified FTO surface.
对半导体材料进行图案化处理对于许多应用（如微电子、显示器和光电探测器）而言都很重要。卤化铅钙钛矿是一类新兴的半导体材料，可通过基于溶液的方法进行图案化处理。在此，我们报告一种全台面图案化策略，即首先生成具有与用于钙钛矿前驱体溶液的有机溶剂不同润湿性的图案化表面，然后将该溶液旋涂到图案化表面上。前驱体溶液仅停留在具有更高亲和力（润湿性）的区域。我们应用连续的阳光引发的硫醇 - 烯反应对玻璃和导电的氟掺杂氧化锡（FTO）透明玻璃表面进行功能化（和图案化）。用不同有机溶剂和水的溶剂接触角测量功能化表面，并通过X射线光电子能谱（XPS）、选择性荧光染色和选择性DNA吸附进行进一步表征。通过简单地在图案化基板上旋涂并烘烤钙钛矿前驱体溶液，我们获得了钙钛矿薄膜微阵列。通过X射线衍射（XRD）、原子力显微镜（AFM）和扫描电子显微镜（SEM）对旋涂的钙钛矿阵列进行表征。我们得出结论，通过连续的阳光引发的硫醇 - 烯点击反应制备的图案化基板适用于通过台面工艺制造钙钛矿阵列。此外，相同的图案化基板可以重复使用几次，直到获得理想的钙钛矿微阵列。在我们测试的几个条件中，二甲基亚砜（DMSO）溶剂以及交替使用羧酸和烷烃修饰的FTO表面是获得高质量钙钛矿微阵列的最佳组合。DMSO在羧酸修饰的FTO表面上的溶剂接触角几乎为零，在十八烷修饰的FTO表面上为65±3°。
