The role of Pb oxidation state of the precursor in the formation of 2D perovskite microplates.
The role of Pb oxidation state of the precursor in the formation of 2D perovskite microplates.
复制标题
前体的Pb氧化态在2D钙钛矿微孔板形成中的作用。
作者：
二维（2D）卤化铅钙钛矿是目前被广泛探索用于光电子学和其他光电应用的令人兴奋的一类材料。它们的离子性质使它们成为溶液加工成薄膜和纳米结构晶体的理想候选物。了解2D卤化铅钙钛矿晶体如何形成是完全控制其物理特性的关键，这可能会产生新的物理现象和设备。在这里，我们调查的影响，铅的氧化态的初始无机前体的生长纯相（n = 1）-波普尔二维钙钛矿BA 2 PbI 4在单步合成。我们研究不同的结晶路线，在暴露PbO 2和PbI 2粉末的BAI：IPA有机卤化物溶液，通过结合原位光学显微镜，紫外可见光谱和时间分辨高效液相色谱。到目前为止，使用PbO 2合成3D LHP的工作引入了将PbO 2还原为PbO或PbI 2的前一步骤。在这项工作中，我们发现，BA 2 PbI 4是直接形成时，暴露PbO 2 BAI：IPA，而不需要外部还原剂。我们解释了这种现象的自发还原/氧化PbO 2/BAI，发生在富碘条件下。我们观察到最终形态（矩形与八角形）和微生物生长速率的差异，我们通过每种情况下涉及的不同化学和碘铅酸盐复合物来解释。因此，这项工作跨越了可用的铅前体的视野，并提供了一个新的旋钮，以控制晶体生长的单步LHP合成。二氧化铅前体作为高度络合的碘代铅酸盐的有效来源用于合成2D卤化铅钙钛矿微板。
Two-dimensional (2D) lead halide perovskites are an exciting class of materials currently being extensively explored for photovoltaics and other optoelectronic applications. Their ionic nature makes them ideal candidates for solution processing into both thin films and nanostructured crystals. Understanding how 2D lead halide perovskite crystals form is key towards full control over their physical properties, which may enable new physical phenomena and devices. Here, we investigate the effects of the Pb oxidation state of the initial inorganic precursor on the growth of pure-phase (n = 1) – Popper 2D perovskite BA2PbI4 in single-step synthesis. We examine the different crystallisation routes in exposing PbO2 and PbI2 powders to a BAI : IPA organo-halide solution, by combining in situ optical microscopy, UV–VIS spectroscopy and time-resolved high performance liquid chromatography. So far, works using PbO2 to synthesise 3D LHPs introduce a preceding step to reduce PbO2 into either PbO or PbI2. In this work, we find that BA2PbI4 is directly formed when exposing PbO2 to BAI : IPA without the need for an external reducing agent. We explain this phenomenon by the spontaneous reduction/oxidation of PbO2/BAI that occurs under iodine-rich conditions. We observe differences in the final morphology (rectangles vs. octagons) and nanocrystal growth rate, which we explain through the different chemistry and iodoplumbate complexes involved in each case. As such, this work spans the horizon of usable lead precursors and offers a new turning knob to control crystal growth in single-step LHP synthesis. Lead dioxide precursor as an efficient source of highly complexed iodoplumbates for the synthesis of 2D lead halide perovskite microplates.
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溶液处理%20钙钛矿%20光%20发射%20二极管%20与%20效率%20超越%2015%%20通过%20添加剂控制%20纳米结构%20剪裁
影响因子：
16.6
作者：
Ban M;Zou Y;Rivett JPH;Yang Y;Thomas TH;Tan Y;Song T;Gao X;Credgington D;Deschler F;Sirringhaus H;Sun B
通讯作者：
Sun B
影响因子：
19
作者：
Chen, Chaoran;Zeng, Linxiang;Guo, Fei
通讯作者：
Guo, Fei
影响因子：
16.6
作者：
Chen, Junnian;Gan, Lin;Zhai, Tianyou
通讯作者：
Zhai, Tianyou
DOI：
10.1016/s1010-6030(98)00214-7
发表时间：
1998-04-15
影响因子：
4.3
作者：
Horvath, O;Miko, I
通讯作者：
Miko, I
影响因子：
15
作者：
Ahn, Namyoung;Son, Dae-Yong;Park, Nam-Gyu
通讯作者：
Park, Nam-Gyu