In situ intercalation dynamics in inorganic-organic layered perovskite thin films.
In situ intercalation dynamics in inorganic-organic layered perovskite thin films.
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DOI：
10.1021/am501568j
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发表时间：
2014-07-09
影响因子：
9.5
通讯作者：
Prakash, G. Vijaya
中科院分区：
文献类型：
--
作者：
Ahmad, Shahab;Kanaujia, Pawan K.;Niu, Wendy;Baumberg, Jeremy J.;Prakash, G. Vijaya
关键词：
层状无机半导体的性质可以通过插入外来分子物种通过一种称为插层的过程来操纵。在本研究中，我们研究了层状金属卤化物(PbI2)基无机半导体中有机部分(R-NH3I)的插层现象，导致了无机-有机(IO)钙钛矿[(R-NH3)2PbI4]的形成。在这种嵌入过程中，产生了强烈的共振激子光学跃迁，使得研究这一过程的动力学成为可能。同时用原位光致发光(PL)和透射率测量来跟踪结构和激子的演化。在实验观察的基础上，提出了一个模型，解释了有机部分通过无机半导体层插层时IO钙钛矿的形成过程。前驱体膜厚度和有机溶液浓度/溶剂之间的相互作用突出了层之间的van der Waals相互作用的作用，以及在插层过程中保持化学计量比的必要性。在插层过程中发生的成核和生长符合Johnson-Mehl-Avrami-Kolmogorov模型，结果既符合理想情况，也符合非理想情况。
The properties of layered inorganic semiconductors can be manipulated by the insertion of foreign molecular species via a process known as intercalation. In the present study, we investigate the phenomenon of organic moiety (R-NH3I) intercalation in layered metal-halide (PbI2)-based inorganic semiconductors, leading to the formation of inorganic–organic (IO) perovskites [(R-NH3)2PbI4]. During this intercalation strong resonant exciton optical transitions are created, enabling study of the dynamics of this process. Simultaneous in situ photoluminescence (PL) and transmission measurements are used to track the structural and exciton evolution. On the basis of the experimental observations, a model is proposed which explains the process of IO perovskite formation during intercalation of the organic moiety through the inorganic semiconductor layers. The interplay between precursor film thickness and organic solution concentration/solvent highlights the role of van der Waals interactions between the layers, as well as the need for maintaining stoichiometry during intercalation. Nucleation and growth occurring during intercalation matches a Johnson–Mehl–Avrami–Kolmogorov model, with results fitting both ideal and nonideal cases.
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