Aqueous Synthesis of Methylammonium Lead Halide Perovskite Nanocrystals
Aqueous Synthesis of Methylammonium Lead Halide Perovskite Nanocrystals
复制标题
水相合成甲基铵卤化铅钙钛矿纳米晶
DOI：
10.1002/anie.201802670
复制
发表时间：
2018-07-26
影响因子：
16.6
通讯作者：
Bi, Wengang
中科院分区：
文献类型：
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作者：
Geng, Chong;Xu, Shu;Bi, Wengang
甲基铵卤化铅钙钛矿纳米晶体提供有吸引力的光电性能，但在水的存在下遭受快速降解。与此相反，我们证明了当pH值保持在0-5的范围内时，通过卤化铅络合物和甲胺之间的反应直接水性合成CH 3 NH3 PbX 3（X=Br或Cl/Br）纳米晶体的可能性。在这些合成条件下，钙钛矿纳米晶体的带正电荷的表面和适当的离子平衡有助于防止它们在水中分解。用有机胺配体进行额外的表面封端进一步将钙钛矿纳米晶体的光致发光量子产率提高到接近40%的值，确保其在环境条件下数月的稳定性，以及其在连续0.1Wmm（-2）405 nm光照射下超过250小时的光致发光性能。
Methylammonium lead halide perovskite nanocrystals offer attractive optoelectronic properties but suffer from fast degradation in the presence of water. In contradiction to this observation, we demonstrate the possibility of a direct aqueous synthesis of CH3NH3PbX3 (X=Br or Cl/Br) nanocrystals through the reaction between the lead halide complex and methylamine when the pH is maintained in the range of 0-5. Under these synthetic conditions, the positively charged surface of the perovskite nanocrystals and the proper ionic balance help to prevent their decomposition in water. Additional surface capping with organic amine ligands further improves the photoluminescence quantum yield of the perovskite nanocrystals to values close to 40%, ensures their stability under ambient conditions for several months, and their photoluminescence performance under continuous 0.1Wmm(-2) 405nm light irradiation for over 250hours.