In-situ intercalation dynamics in inorganic-organic layered perovskite thin films
Kanaujia, Pawan K
Prakash, G Vijaya
ACS Applied Materials & Interfaces
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Ahmad, S., Kanaujia, P. K., Niu, W., Baumberg, J., & Prakash, G. V. (2014). In-situ intercalation dynamics in inorganic-organic layered perovskite thin films. ACS Applied Materials & Interfaces https://doi.org/10.1021/am501568j
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. Based on 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 non-ideal cases.
inorganic-organic perovskite thin films, natural multiple quantum wells, intercalation dynamics, room-temperature excitons
This work is part of High-Impact Research scheme of IIT Delhi, Nano Research Facility (MCIT, Govt. Of India), UK-India Education and Research Initiative (UKIERI) programme, and part funded by EPSRC grant EP/G060649/1, and ERC LINASS 320503.
European Research Council (320503)
External DOI: https://doi.org/10.1021/am501568j
This record's URL: https://www.repository.cam.ac.uk/handle/1810/245409