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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Reaction between Pyridine and CH3NH3PbI3: Surface-Confined Reaction or Bulk Transformation?
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Reaction between Pyridine and CH3NH3PbI3: Surface-Confined Reaction or Bulk Transformation?

机译：吡啶和CH3NH3PBI3之间的反应：表面限制反应或散装转化？

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Pyridine molecules have been used to passivate surface Pb2+ sites of CH3NH3PbI3, to recrystallize CH3NH3PbI3, and to bleach CH3NH3PbI3. However, these results contradict each other, as recrystallization and optical-bleach require transformation of bulk CH3NH3PbI3, but surface passivation demands the confinement of the reaction at the surface region. The underlying mechanism for these seemly contradicting results is not yet understood. In this paper, we show, at 25 degrees C, partial pressure of pyridine vapor is a determining factor for its reaction behaviors with CH3NH3PbI3: one can modify the surface region of CH3NH3PbI3 by using pyridine vapor of pressure 1.15 torr or lower but can transform the whole bulk CH3NH3PbI3 film with a pyridine vapor of 1.3 torr or higher. Our result is the first demonstration that the reaction modes, i.e., surface-confined reaction and bulk transformation, are very sensitive to the partial pressure of under-saturated pyridine vapor. Despite the different reaction behaviors, it is interesting that in all pressure ranges, pyridinium ion is a main product from the reaction between pyridine and CH3NH3PbI3 the reaction between pyridine and CH3NH3PbI3. It is important to note 1.3 torr is much smaller than the saturated vapor pressure of pyridine (20 torr at 25 degrees C). These findings provide a guidance in applying pyridine and other amines to functionalize and transform CH3NH3PbI3 and other hybrid halide perovskites. It also highlights the critical role of fundamental studies in controllably modifying CH3NH3PbI3.
机译：吡啶分子已被用于钝化CH 3 NPB13的表面PB2 +位点，以重结晶CH 3 NH 3 PBI 3，并漂白CH3NH3PBI3。然而，这些结果彼此矛盾，因为重结晶和光学漂白剂需要转化块状CH 3 NPBI3，但表面钝化需要在表面区域处的反应限制。尚未理解这些看似矛盾的结果的潜在机制。在本文中，在25摄氏度下，吡啶蒸气的分压是其反应行为的含量与CH3NH3PBI3的确定因子：一种可以通过使用压力1.15托或更低的吡啶蒸气来改变CH 3 NH 3 PBI3的表面区域，但可以改变整个散装CH3NH3PBI3膜，吡啶蒸气为1.3托或更高。我们的结果是第一次证明反应模式，即表面狭窄的反应和散装转化对饱和吡啶蒸气的分压非常敏感。尽管反应行为不同，但在所有压力范围内，吡啶离子是吡啶和CH3NH3PB1之间的反应的主要产物，吡啶和CH3NH3PBI3之间的反应。值得注意的是1.3托比吡啶的饱和蒸气压力小得多（25摄氏度为20℃）。这些发现提供了吡啶和其他胺的指导，以官能化和转化CH3NH3PBI3和其他杂交卤化物钙酸盐。它还突出了基本研究在可控制的CH3NH3PBI3中的关键作用。

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