Journal Article covalent organic frameworks flexible devices memristors organic single crystals 2D 2D imine polymers Boltzmann tyranny covalent organic framework microspheres donor–accepter architecture fluorinated 2D polymer film functionalization linker exchange low variability molecular memristor multilevel memory devices neuromorphic computing nonvolatile memory organic electronics organic field-effect transistors organic phototransistors phototransistors scalability self‐complementary π–electronic force self‐limited dynamic exchange single layer 2D polymer stationary phases subthreshold swing