Xiao Xiaolin, Li Ye, Xie Rong-Jun
College of Materials, Xiamen University, No. 422, Simingnan Road, Xiamen 361005, China.
Nanoscale. 2020 Apr 28;12(16):9231-9239. doi: 10.1039/c9nr10885h. Epub 2020 Apr 20.
Low dimensional semiconductor nanomaterials show great promise for a variety of applications due to their size-dependent and excellent optoelectronic properties. In this work, we developed a strategy to synthesize uniform and very thin CsPbBr perovskite nanoplates (NPls) by introducing additional metal bromides. The CsPbBr NPls, self-assembled into a face-to-face stacked state, had a thickness of 4.4 nm (equal to only 2 monolayers, 2 MLs) and showed a maximum emission at 437 nm and a narrow FWHM of 14 nm. The formation mechanism of the CsPbBr NPls by adding FeBr was ascribed to the constrained growth of CsPbBr nanocubes when the surface Cs ions were substituted by the protonated oleylammonium from the byproduct OLA-HBr.
低维半导体纳米材料因其尺寸依赖性和优异的光电特性，在各种应用中展现出巨大潜力。在本工作中，我们通过引入额外的金属溴化物，开发了一种合成均匀且超薄的CsPbBr钙钛矿纳米片（NPls）的策略。自组装成面对面堆叠状态的CsPbBr NPls厚度为4.4纳米（仅相当于2个单分子层，2 MLs），在437纳米处显示出最大发射峰，半高宽为14纳米。添加FeBr形成CsPbBr NPls的机制归因于当表面Cs离子被副产物OLA-HBr中质子化的油胺取代时，CsPbBr纳米立方体的受限生长。
