Deepthi Krishnan, R B Amal Raj, Prasad Vadakkethonippurathu Sivankuttynair, Gowd E Bhoje
Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India.
Soft Matter. 2020 Aug 21;16(31):7312-7322. doi: 10.1039/d0sm00894j. Epub 2020 Jul 16.
Here, we demonstrate the three-component self-assembly of functionalized small molecules (donor and acceptor) and a polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) block copolymer using the supramolecular approach. The introduction of functional groups on both the donor (1-pyrenebutyric acid, PBA) and acceptor (functionalized naphthalene diimide, FNDI) molecules can form stable charge-transfer (CT) complexes within the block copolymer domains and these supramolecules exhibited a charge carrier mobility of around 1.01 × 10 cm (V s). In this case, both the molecules can form H-bonding with P4VP chains, and as well as π-π stacking between the PBA and FNDI molecules is also possible within the block copolymer domains. These noncovalent interactions lead to the formation of stable hierarchical structures and CT complexes between PBA and FNDI, where bilayer donor-acceptor (D-A) stacks formed within the block copolymer microdomains. Overall, the organization of both functionalized donor and acceptor molecules within the block copolymer domain exhibits an enhanced charge carrier mobility, which is potentially useful in the fabrication of organic photovoltaic cells and organic light-emitting diodes.
在此，我们利用超分子方法展示了功能化小分子（供体和受体）与聚苯乙烯-嵌段-聚（4-乙烯基吡啶）（PS-b-P4VP）嵌段共聚物的三组分自组装。在供体（1-芘丁酸，PBA）和受体（功能化萘二亚胺，FNDI）分子上引入官能团可在嵌段共聚物域内形成稳定的电荷转移（CT）络合物，并且这些超分子表现出约1.01×10 cm²/（V·s）的电荷载流子迁移率。在这种情况下，两种分子都能与P4VP链形成氢键，而且在嵌段共聚物域内PBA和FNDI分子之间也可能存在π-π堆积。这些非共价相互作用导致形成稳定的层级结构以及PBA和FNDI之间的CT络合物，其中在嵌段共聚物微域内形成了双层供体-受体（D-A）堆叠。总体而言，功能化供体和受体分子在嵌段共聚物域内的组织表现出增强的电荷载流子迁移率，这在有机光伏电池和有机发光二极管的制造中可能具有潜在用途。
