Polymer Zwitterions for Stabilization of CsPbBr₃ Perovskite Nanoparticles and Nanocomposite Films

Abstract

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Transforming colloidal Cs4PbBr6 nanocrystals with poly(maleic anhydride-alt-1-octadecene) into stable CsPbBr3 perovskite emitters through intermediate heterostructures

“…17 Interestingly, stability enhancement has been reported irrespective of whether polymer chains preserve the native CsPbX 3 NC surface ligands as in the case of polystyrene [17][18][19] and poly(styreneethylene-butylene-styrene), 17 or whether the polymer adheres to the surface of CsPbX 3 NCs as in the case of ammonium bromide-terminated polystyrene 20 or poly(n-butyl methacrylate) modied with zwitterionic sulfobetaine or phosphorylcholine functional groups. 21 Arguably, an ideal NC transformation of Cs 4 PbBr 6 / CsPbBr 3 in this context could be caused by a polymer which acts both as a reactant and a macromolecular surfactant, 20 minimizing the number of reagents and preparatory steps involved in the process.…”

Modular Zwitterion-Functionalized Poly(Isopropyl Methacrylate) Polymers for Hosting Luminescent Lead-Halide Perovskite Nanocrystals

“…Zwitterionic polymers have been used to passivate perovskite thin films, [69][70] and while this manuscript was in preparation, zwitterionic polymers were reported to stabilize CsPbBr3 NCs in solution and solid state. [71][72] These works solidify the idea that zwitterionic polymers have high potential as perovskite NC host matrices.…”

Direct optical patterning of perovskite nanocrystals with ligand cross-linkers

“…This high patterning efficiency, originated from the nonspecific nature of nitrene insertion, distinguishes DOPPLCER from methods based on ligands with specific, cross-linkable fragments. The latter typically involve high mass ratio (ligand/NCs over 100%) of long, insulating polymeric ligands ( 29 , 31 ) and high exposure doses ( 31 ). Similar contrast in patterning efficiency of the nonspecific and specific cross-linking mechanism has been observed in the case of polymers ( 34 ).…”

“…2C). Note that these exposure doses are comparable to those required for commercial photoresists and remarkably lower than those for NCs with photoactive ligands containing crosslinkable C═C and benzophenone groups (in the order of several J cm −2 ) (30,31). Patterning of perovskite NCs at low doses is critical for reducing photodamages.…”

“…Complementing the design of short, photodecom posable ligands, polymeric ligands with crosslinkable fragments also allow direct patterning of perovskite NCs via cycloaddition, polymerization, and other pathways (29). However, patterning with these polymeric ligands usually yields NC composites in an insulating matrix with hindered charge injection/extraction/transport (29)(30)(31). In addition, these direct patterning methods for perovskite NCs re quire judicious selection of photoactive ligands (short/decomposable or long/crosslinkable).…”