Supramolecular Donor-Acceptor Heterojunctions by Vectorial Stepwise Assembly of Porphyrins and Coordination-Bonded Fullerene Arrays for Photocurrent Generation

摘要

Bicontinuous donor-acceptor (D-A) arrays at the molecular level have attracted increasing scientific and technological interest because of their potential applications in organic photovoltaics. Such D-A arrays would yield efficient charge separation (CS) and transportation of separated charges to their respective electrodes, leading to enhanced photocurrent generation provided that the vertical arrangement of the D-A arrays on the electrodes is ideal. Although nanostructures with bicontinuous D-A arrays have been obtained by self-assembly of D-A molecules, it is still difficult to achieve the desirable vertical arrangement of bicontinuous D-A arrays on an electrode. Here we report a novel approach for constructing a vertical alignment of bicontinuous D-A arrays on a flat SnO_2 electrode for use as a photoelectrochemical device (Figure 1).