摘要
The rapid development of solar cells based on lead halide perovskites(LHPs)has prompted very active research activities in other closely-related fields.Colloidal nanostructures of such materials display superior optoelectronic properties.Especially,onedimensional(1D)LHPs nanowires show anisotropic optical properties when they are highly oriented.However,the ionic nature makes them very sensitive to external environment,limiting their large scale practical applications.Here,we introduce an amphiphilic block copolymer,polystyrene-block-poly(4-vinylpyridine)(PS-P4VP),to chemically modify the surface of colloidal CsPbBr3 nanowires.The resulting core-shell nanowires show enhanced photoluminescent emission and good colloidal stability against water.Taking advantage of the stability enhancement,we further applied a modified Langmuir-Blodgett technique to assemble monolayers of highly aligned nanowires,and studied their anisotropic optical properties.
基金
This work was supported by the U.S.Department of Energy,Office of Science,Office of Basic Energy Sciences,Materials Sciences and Engineering Division,under Contract No.DE-AC02-05-CH11231 within the Physical Chemistry of Inorganic Nanostructures Program(KC3103).M.S.acknowledges his support from the National Science Foundation Graduate Research Fellowship under Grant No.DGE 1752814.
