Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. charge transport layers conducting polymers diketopyrrolopyrrole‐based polymers direct optical patterning ecofriendly colloidal nanocrystals electroluminescence film‐state ligand exchange implantable devices ligand crosslinking metal halide perovskites neurostimulation overactive bladder solar cells surface chemistry triboelectric implants ultrasound energy harvesting