Selective Silver Nanocluster Metallization on Conjugated Diblock Copolymer Templates for Sensing and Photovoltaic Applications
Selective Silver Nanocluster Metallization on Conjugated Diblock Copolymer Templates for Sensing and Photovoltaic Applications
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DOI：
10.1021/acsanm.1c00829
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发表时间：
2021-04-07
影响因子：
5.9
通讯作者：
Roth, Stephan, V
中科院分区：
文献类型：
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作者：
Gensch, Marc;Schwartzkopf, Matthias;Roth, Stephan, V
具有纳米结构金属和/或聚合物界面的聚合物-金属复合膜显示出光电应用的重要前景，例如，作为传感器或在有机光致发光器件（OPV）中。在这些装置中使用的聚合物组分主要是具有共轭π电子系统的纳米结构导电聚合物。增强的OPV的功率转换效率或传感器灵敏度可以通过在聚合物模板上或聚合物模板中选择性地沉积金属来实现。在这项研究中，我们利用时间分辨掠入射X射线散射观察金属-聚合物界面的形成和集群微晶尺寸原位银（Ag）溅射沉积在聚（3-己基噻吩-2，5-二基）-b-聚（甲基丙烯酸甲酯）（PMMA-b-P3 HT）模板。我们比较所产生的纳米尺度的形态与电子性能，确定银生长制度，并量化的选择性银生长的二嵌段共聚物（DBC）模板使用相应的均聚物薄膜（P3 HT和PMMA）作为参考。因此，我们能够描述各自的聚合物块和衬底效应对Ag簇渗流的影响：渗流阈值与在溅射沉积期间用电阻测量原位测量的绝缘体到金属过渡相关。在完整的金属膜覆盖聚合物表面之前，PMMA-b-P3 HT上的Ag簇渗流已经在六边形P3 HT域的网络上开始，这通过显微测量来补充。在一般情况下，这项研究表明了一种可能的方法，选择性银生长作为支架电极制备纳米电子学和能量收集应用。
Polymer-metal composite films with nanostructured metal and/or polymer interfaces show a significant perspective for optoelectronic applications, for example, as sensors or in organic photovoltaics (OPVs). The polymer components used in these devices are mostly nanostructured conductive polymers with conjugated pi-electron systems. Enhanced OPV's power conversion efficiencies or sensor sensitivity can be achieved by selective metal deposition on or into polymer templates. In this study, we exploit time-resolved grazing-incidence X-ray scattering to observe the metal-polymer interface formation and the cluster crystallite size in situ during silver (Ag) sputter deposition on a poly(3-hexylthiophene-2,5-diyl)-b-poly(methyl methacrylate) (PMMA-b-P3HT) template. We compare the arising nanoscale morphologies with electronic properties, determine Ag growth regimes, and quantify the selective Ag growth for the diblock copolymer (DBC) template using the corresponding homopolymer thin films (P3HT and PMMA) as a reference. Hence, we are able to describe the influence of the respective polymer blocks and substrate effects on the Ag cluster percolation: the percolation threshold is correlated with the insulator-to-metal transition measured in situ with resistance measurements during the sputter deposition. The Ag cluster percolation on PMMA-b-P3HT starts already on the network of the hexagonal P3HT domain before a complete metal film covers the polymer surface, which is complemented by microscopic measurements. In general, this study demonstrates a possible method for the selective Ag growth as a scaffold for electrode preparation in nanoelectronics and for energy harvesting applications.