In Situ Intercalation Dynamics in Inorganic-Organic Layered Perovskite Thin Films

被引:96
|
作者
Ahmad, Shahab [1 ]
Kanaujia, Pawan K. [1 ]
Niu, Wendy [2 ]
Baumberg, Jeremy J. [2 ]
Prakash, G. Vijaya [1 ]
机构
[1] Indian Inst Technol Delhi, Dept Phys, Nanophoton Lab, New Delhi 110016, India
[2] Univ Cambridge, Cavendish Lab, Nanophoton Ctr, Cambridge CB3 0HE, England
基金
欧洲研究理事会; 英国工程与自然科学研究理事会;
关键词
inorganic-organic perovskite thin films; natural multiple quantum wells; intercalation dynamics; room-temperature excitons; PHASE-TRANSITIONS; HYBRID MATERIALS; SOLAR-CELLS; NUCLEATION; DEPOSITION; GROWTH; MICROSTRUCTURE; SEMICONDUCTORS; MECHANISMS; HYDROXIDES;
D O I
10.1021/am501568j
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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)(2)PbI4]. 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.
引用
收藏
页码:10238 / 10247
页数:10
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