Fabrication of Potassium- and Rubidium-Doped Formamidinium Lead Bromide Nanocrystals for Surface Defect Passivation and Improved Photoluminescence Stability.
Fabrication of Potassium- and Rubidium-Doped Formamidinium Lead Bromide Nanocrystals for Surface Defect Passivation and Improved Photoluminescence Stability.
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DOI：
10.1021/acsaelm.3c01542
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发表时间：
2024-01-23
影响因子：
4.7
通讯作者：
Su, Lei
中科院分区：
文献类型：
--
作者：
Tabassum, Madeeha;Zia, Qasim;Ye, Huanqing;Neal, William George;Aslam, Sameen;Zhang, Jinshuai;Su, Lei
在过去的十年里，金属卤化物钙钛矿纳米晶(NCS)得到了迅速的发展，其在纳米技术中的潜在应用证明了这一点。它们独特的光致发光特性背后的无可比拟的化学性质吸引了越来越多的研究人员。然而，钙钛矿型纳米碳管的低本征稳定性和表面缺陷阻碍了其广泛应用。因此，许多技术，如掺杂和封装(聚合物基质、二氧化硅涂层、盐基质等)研究了钙钛矿型纳米碳管的表面改性，以提高其效率和稳定性。在本研究中，我们展示了在NCS的胶体制备过程中引入钾(K)或Rb(Rb)对表面缺陷进行自钝化的方法，从而大大提高了NCS的结晶度、光致发光和辐射效率。此外，K掺杂的NCS具有长达1个月以上的胶体稳定性，这表明NCS与较小尺寸的钾离子(K+)之间有很强的成键作用。我们观察到当K+停留在纳米晶体结构的间隙位置时，辐射寿命的提高也可以用防止“Frenkel缺陷”来解释。此外，我们目前的发现表明了使用碱金属离子表面修饰技术来减少钙钛矿纳米晶(PeNC)表面陷阱的重要性。类似的发展可以应用于多晶钙钛矿薄膜，以降低界面陷阱密度。这项研究的发现对未来的发光应用有几个重要的启示。
The past decade has seen a rapid development in metal halide perovskite nanocrystals (NCs), which has been witnessed by their potential applications in nanotechnology. The inimitable chemical nature behind their unique photoluminescence characteristics has attracted a growing body of researchers. However, the low intrinsic stability and surface defects of perovskite NCs have hampered their widespread applications. Therefore, numerous techniques such as doping and encapsulation (polymer matrices, silica coating, salt matrix, etc.) have been examined for the surface modification of perovskite NCs and to increase their efficiency and stability. In this study, we demonstrated the self-passivation method for surface defects by introducing potassium (K) or rubidium (Rb) during the colloidal fabrication of NCs, resulting in the much-improved crystallinity, photoluminescence, and improved radiative efficiency. In addition, K-doped NCs showed a long-term colloidal stability of more than 1 month, which indicates the strong bonding between the NCs and the smaller-sized potassium cations (K+). We observed the enhancement of the radiative lifetime that can also be explained by the prevention of “Frenkel defects” when K+ stays at the interstitial site of the nanocrystal structure. Furthermore, our current findings signify the importance of surface modification techniques using alkali metal ions to reduce the surface traps of perovskite nanocrystals (PeNCs). Comparable developments could be applied to polycrystalline perovskite thin films to reduce the interface trap densities. The findings of this study have several important implications for future light-emitting applications.
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