American Chemical Society
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Illuminating the Nanoparticle Array: Unveiling the Interplay between Photodegradation and Aggregation Degree of CsPbBr3 Nanocrystals

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journal contribution
posted on 2023-08-12, 13:06 authored by Yuchen Zhang, Jiayue Xu, Tingxun Yan, Jiahao Pan, Xing Xing, Zhenda Lu
All inorganic CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) have attracted significant attention because of their outstanding photoelectrical properties. However, the stability of CsPbX3 NCs still poses a challenge for their practical applications due to the inherent ionic nature. Previous research has investigated the photodegradation of CsPbBr3 NCs, but the exact structure–property correlation is still not very clear. Furthermore, whether the photodegradation is affected by the aggregation degrees of the CsPbBr3 NCs has not yet been considered. Here, a robust strategy to fabricate the CsPbBr3 NC array with varied aggregation degrees was developed through atomic force microscopy (AFM) nanoxerography. The number of CsPbBr3 NCs in one spot of the array, noted as the aggregation degree, could be tuned by the corresponding surface potential values. Based on the precise positioning within the array system, each spot can be easily associated with on-site TEM characterization. In addition, photoluminescence intensity traces over time of each spot could be simultaneously measured under the same conditions. The statistical results clearly demonstrated that spots with higher aggregation degrees (25–60 NCs) exhibited a relatively slower decline rate, indicating higher photostability. These findings could provide valuable insights into the development of functional nanodevices based on CsPbBr3 NCs.