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Tuning the Size of CsPbBr3 Nanocrystals: All at One Constant Temperature
ACS Energy Letters ( IF 22.0 ) Pub Date : 2018-01-10 00:00:00 , DOI: 10.1021/acsenergylett.7b01226
Anirban Dutta 1 , Sumit Kumar Dutta 1 , Samrat Das Adhikari 1 , Narayan Pradhan 1
Affiliation  

For varying the size of perovskite nanocrystals, variation in the reaction temperature and tuning the ligand chain lengths are established as the key parameters for high-temperature solution-processed synthesis. These also require sharp cooling for obtaining desired dimensions and optical stability. In contrast, using preformed alkylammonium bromide salt as the precise dimension-controlling reagent, wide window size tunable CsPbBr3 nanocrystals were reported without varying the reaction temperature or changing the ligands. The size tunability even with ∼1 nm step growth regimes was achieved as a function of only the concentration of added alkylammonium bromide salt. Not only the cube shape but also the width varied in the sheet structures. Because these nanostructures lose their optical stability and crystal phase on prolonged annealing, stabilizing these in high-temperature synthesis for all-inorganic lead halide perovskites is important and remains challenging. In this aspect, this method proved to be more facile because it does not require sharp cooling, and the nanocrystals retained their phase and optical properties even upon prolonged annealing.

中文翻译:

调整CsPbBr 3纳米晶体的尺寸:全部在一个恒定温度下进行

为了改变钙钛矿纳米晶体的尺寸,反应温度的变化和配体链长度的调整被确定为高温固溶处理合成的关键参数。这些也需要急剧冷却以获得期望的尺寸和光学稳定性。相反,使用预制的烷基溴化铵盐作为精确的尺寸控制试剂,宽窗口尺寸可调CsPbBr 3报道了纳米晶体没有改变反应温度或改变配体。甚至在〜1 nm的步进生长条件下,尺寸的可调性也仅取决于所添加的烷基溴化铵盐浓度的函数。在片状结构中,不仅立方体形状而且宽度变化。由于这些纳米结构在长时间退火后会失去其光学稳定性和晶相,因此在高温合成全无机卤化铅钙钛矿中稳定这些纳米结构非常重要,并且仍然具有挑战性。在这方面,该方法被证明是更容易的,因为它不需要急剧的冷却,并且即使长时间退火,纳米晶体也能保持其相态和光学性质。
更新日期:2018-01-10
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