▎ 摘　　要

NOVELTY - Multilayer structure comprises a covalent organic framework (COF) layer in contact with polycyclic aromatic carbon (PAC) layer which has a first side and a second side, where the PAC layer is in contact with a substrate, so that the COF is in contact with a first side of the PAC layer and the substrate is in contact with a second side of the PAC layer. USE - The multilayer structure is useful in device comprising a solar cell, a flexible display, a lighting device, a radio-frequency identification tag, a sensor, a photoreceptor, a battery, a capacitor, a gas-storage device and a gas-separation device (all claimed). ADVANTAGE - The multilayer structure: provides COF layers that are more ordered; provides two-dimensional COF films on single-layer graphene under simple solvothermal conditions with improved crystallinity within 15 minutes; provides thin-film for electronic devices; enables fabrication of improved solar cells, photovoltaic devices and light-emitting devices; and provides vertically oriented films that shows unprecedented crystallinity and perfect vertical alignment (nearly zero mosaic spread) without a detectable stacking fault. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for forming the COF layer comprising: contacting a subunit compound with a multifunctional linker compound in presence of the PAC layer, where the PAC layer is in contact with the substrate, and a solvent, so that at least two subunit compounds react with the multifunctional linker compound to form at least one covalent bond and the COF layer is formed on the PAC layer.