A Rapid and Robust Light-and-Solution-Triggered In Situ Crafting of Organic Passivating Membrane over Metal Halide Perovskites for Markedly Improved Stability and Photocatalysis.
A Rapid and Robust Light-and-Solution-Triggered In Situ Crafting of Organic Passivating Membrane over Metal Halide Perovskites for Markedly Improved Stability and Photocatalysis.
复制标题
DOI：
10.1021/acs.nanolett.0c04299
复制
发表时间：
2021-02
期刊：
影响因子：
10.8
通讯作者：
Fangyan Liu;Mengye Wang;Xiaolong Liu;Biao Wang;Caifu Li;Chenning Liu;Zhang Lin;Feng Huang
中科院分区：
文献类型：
--
作者：
Fangyan Liu;Mengye Wang;Xiaolong Liu;Biao Wang;Caifu Li;Chenning Liu;Zhang Lin;Feng Huang
尽管在太阳能电池、发光二极管和半导体中具有有趣的光电属性，但有机-无机钙钛矿的不稳定性对长期应用构成了巨大挑战。在这里，我们报告了一个简单而强大的策略，通过光和溶液处理，以创建一个有机膜，有效地钝化CH 3 NH3 PbI 3（MAPbI 3）。具体地，在碘化氢水溶液中的MAPbI 3上观察到MA+的重构。当MAPbI 3被照射时，HIO 3分子通过水和I2之间的反应产生。在不同钙钛矿颗粒处的HIO 3分子之间的氢键不仅引导钙钛矿颗粒的creelike生长，而且原位形成牢固地锚定在钙钛矿表面上的钝化层，其中亲水性-NH 3+基团束缚到钙钛矿和疏水性-CH 3部分暴露于空气。有趣的是，这种MA+膜大大提高了钙钛矿对水分的稳定性以及它们的晶体质量，大大提高了光催化析氢速率。
Despite intriguing optoelectronic attributes in solar cells, light-emitting diodes, and photocatalysis, the instability of organic-inorganic perovskites poises a grand challenge for long-term applications. Herein, we report a simple yet robust strategy via light-and-solution treatment to create an organic membrane that effectively passivates CH3NH3PbI3 (MAPbI3). Specifically, the restructuring of MA+ is observed on MAPbI3 in aqueous hydrogen iodide. HIO3 molecules are generated via the reaction between water and I2 induced by photocatalysis when MAPbI3 is illuminated. The hydrogen bonding between HIO3 molecules at different perovskite particles not only directs the creeplike growth of perovskite particles but also in situ forms a passivating layer firmly anchoring on the perovskite surface with hydrophilic -NH3+ groups tethering to perovskites and hydrophobic -CH3 moieties exposed to air. Intriguingly, such MA+ film greatly improves the stability of perovskites against moisture as well as their crystal quality, considerably enhancing the photocatalytic hydrogen evolution rate.