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Charge Transfer Boosting Moisture Resistance of Seminude Perovskite Nanocrystals via Hierarchical Alumina Modulation
The Journal of Physical Chemistry Letters ( IF 5.7 ) Pub Date : 2020-04-03 , DOI: 10.1021/acs.jpclett.0c00811
Wenli Zhou 1 , Yanling Zhao 2 , Ensheng Wang 1 , Qingna Li 1 , Sunqi Lou 3 , Jing Wang 3 , Xiaoming Li 4 , Qing Lian 5 , Qingji Xie 1 , Rui-Qin Zhang 2, 6, 7 , Haibo Zeng 4
Affiliation  

Boosting the stability improvement of cesium lead halide (CsPbX3) perovskite nanocrystals (NCs) remains a serious challenge. In this work, CsPbX3 NCs are effectively anchored on a hierarchical (h-) alumina (Al2O3) substrate to form seminude CsPbX3@h-Al2O3 composites, which can emit strong green light even after being stored in water for 30 days, in sharp contrast to the pure CsPbBr3 NCs. Other oxides, such as TiO2, ZnO, and SiO2, have no boosting effect on the moisture resistance of perovskite NCs. Subsequent density functional theory calculations reveal a significant charge transfer and strong Coulomb attraction between CsPbBr3 and Al2O3. The substantial charge transfer via alumina substrate modulation not only can enhance the internal stability of CsPbBr3 but also can cause CsPbBr3 to be insensitive to water adsorption. These findings are expected to deepen our understanding of improving the stability of CsPbBr3 NCs and shed light on the design of novel perovskite composites for long-term stable optoelectronic devices.

中文翻译:

电荷转移通过分层氧化铝调制提高半钙钛矿纳米晶的耐湿性

促进卤化铯铅(CsPbX 3)钙钛矿纳米晶体(NCs)稳定性的提高仍然是一个严峻的挑战。在这项工作中,将CsPbX 3 NC有效地锚固在分层(h-)氧化铝(Al 2 O 3)基底上,以形成半裸CsPbX 3 @ h -Al 2 O 3复合材料,即使将其存储在铝中也可以发出强绿色光。与纯CsPbBr 3 NCs形成鲜明对比的是,水要持续30天。其他氧化物,例如TiO 2,ZnO和SiO 2,对钙钛矿NC的耐湿性没有促进作用。随后的密度泛函理论计算表明,CsPbBr 3和Al 2 O 3之间存在明显的电荷转移和强大的库仑吸引力。通过氧化铝基质调制进行的大量电荷转移不仅可以增强CsPbBr 3的内部稳定性,还可以导致CsPbBr 3对水的吸附不敏感。这些发现有望加深我们对改善CsPbBr 3 NC稳定性的理解,并为长期稳定的光电器件的新型钙钛矿复合材料的设计提供启发。
更新日期:2020-04-24
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