prepared the earliest perovskite solar cells, selecting organic–inorganic hybrid perovskite materials CH 3NH 3PbX 3 (X = Br, I) as new photosensitizer to replace the dyes in traditional DSSCs. Owing to the high absorption coefficient, long carrier diffusion distance, tunable emission bandgap and high photoluminescence quantum yield, colloidal metal halide perovskite nanocrystals have been intensively explored in laser, photodetector, light-emitting diode (LED) and solar cell. The CsPbBr 3/TiO 2 nanocrystals have a high PLQY and have a promising application in solar cells. CsPbBr 3/TiO 2 nanocrystals show the great thermal stability after the post-annealing.Ĥ. Explored its essences of PL and lifetime of the synthesized CsPbBr 3/TiO 2 perovskite nanocrystals.ģ. Prepared the all-inorganic CsPbBr 3/TiO 2 core/shell perovskite nanocrystals by an easy method.Ģ. The results provide an effective method to solve the stability problem of perovskite nanostructures and are expected to have a promising application in optoelectronic fieldsġ. Results show that the coating of TiO 2 on CsPbBr 3 NCs greatly suppressed the anion exchange and photodegradation, which are the main reasons for dramatically improving their chemical stability and photostability. Time-resolved photoluminescence decay shows that the lifetime of CsPbBr 3/TiO 2 nanocrystals is about 4.04 ns and keeps great stability after lasting two months in the air. The CsPbBr 3/TiO 2 nanocomposites exhibit excellent stability, remaining the identical particle size (9.2 nm), crystal structures and optical properties. In this work, monodisperse CsPbBr 3/TiO 2 nanocrystals are successfully prepared by coating titanium precursor on the surface of colloidal CsPbBr 3 nanocrystals at room temperature. The poor stability of CsPbX 3 (X = Cl, Br, I) perovskite nanocrystals is the most impediment to its application in the field of photoelectrics.
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