Enhanced stabilization of inorganic cesium lead triiodide (CsPbI3) perovskite quantum dots with tri-octylphosphine
Enhanced stabilization of inorganic cesium lead triiodide (CsPbI3) perovskite quantum dots with tri-octylphosphine
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DOI：
10.1007/s12274-017-1685-1
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发表时间：
2018-02-01
期刊：
影响因子：
9.9
通讯作者：
Geyer, Scott M.
中科院分区：
文献类型：
--
作者：
Lu, Chang;Li, Hui;Geyer, Scott M.
近年来，钙钛矿材料受到了极大的关注。特别地，基于三碘化铅的钙钛矿显示出极好的光电性能。提高这些材料的稳定性是迈向大规模应用的重要一步。在这项研究中，通过简单地添加三辛基膦（TOP）作为合成后处理的一部分，我们显着提高了CsPbI 3量子点（QD）在溶液相中的稳定性，否则会在数小时内迅速衰减。对于用TOP处理的CsPbI 3量子点，吸收和光致发光发射特性在数周内没有变化，并且量子产率即使在1个月后也几乎保持恒定在30%。经处理和未经处理的QD的形态最初都是立方体;然而，经处理的QD在很大程度上保持其初始尺寸和形状，而未经处理的QD失去尺寸均匀性，这是降解的迹象。红外光谱和X射线光电子能谱证实了在TOP处理的量子点中存在P。我们的见解有助于解决三碘化物钙钛矿材料和器件的固有不稳定性问题。
In recent years, significant attention has been paid to perovskite materials. In particular, lead triiodide-based perovskites have exhibited superb optoelectronic properties. Enhancing the stability of these materials is an essential step towards large-scale applications. In this study, by simply adding trioctylphosphine (TOP) as part of the post-synthesis treatment, we significantly enhance the stability of CsPbI3 quantum dots (QDs) in the solution phase, which otherwise decay rapidly in hours. For CsPbI3 QDs treated with TOP, the absorption and photoluminescence emission properties are unchanged over the course of weeks, and the quantum yield remains almost constant at 30% even after 1 month. The morphologies of both treated and untreated QDs are initially cubic; however, the treated QDs largely maintain their initial size and shape, while the untreated ones lose size uniformity, which is a sign of degradation. Infrared spectroscopy and X-ray photoelectron spectroscopy confirm the presence of P in the TOP-treated QDs. We insights that help to resolve the intrinsic instability issue of triiodide perovskite materials and devices.