科研之友
微信
新浪微博
Facebook
分享链接
摘要
Random mixtures of phthalocyanines (Pcs) with fullerene C-60 are currently exploited as active layers in organic solar cells. Therefore, spatially regular Pc-C-60 heterostructures, not designed so far, are of great interest as molecularly mixed donor-acceptor phases for further improving the device performance. Here we investigate the prospects to create such heterostructures by fine intermixing of pi-rich Pcs with fullerene C-60. Specifically, this work reports on the mixing behavior of cobalt tetrakis(3-amino-5-tert-butyl)phthalocyanine (CoPc#) with fullerene C-60. A composite film (CoPc#/C-60 = 1:2, mol) was prepared by the Langmuir-Schaefer technique from a floating layer with double-decker architecture, where the CoPc# monolayer was interlinked with the C-60 submonolayer by the clustered water. This film was structurally analyzed and compared with the CoPc# film used as a reference. The latter film is found to be constructed from the 2-stack dye aggregates, which are assembled in the chi-phase mode, randomly oriented, and loosely packed. In the composite film, the C-60 molecules tend to intercalate into the interaggregate voids, making the aggregates consolidate and align in the vertical direction. Accordingly, the delamination process, which freely occurs in the pristine dye film, is inhibited in the composite. All aggregative features of CoPc# indicate that both structure and arrangement of the dye aggregates are determined by water-assisted H bonding via the primary amine groups. This kind of interaction is of use for tailoring Pc-based frameworks capable to host the C-60 molecules.
- 出版日期2014-7-3
