Shape Tuning of Colloidal CH3NH3PbBr3 Nanocrystals through Self-Organization Process

Sheng Huang^a, Lige Liu^a, Haizheng Zhong^b

^aBeijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology,, 5 Zhongguancun South Street, Haidian District, 100081, Beijing, (China), China

^bSchool of Materials Science & Engineering, Beijing Institute of Technology, 5 Zhongguancun south street, Beijing, China, beijing China, China

Materials for Sustainable Development Conference (MATSUS)
Proceedings of September Meeting 2016 (NFM16)

Berlin, Germany, 2016 September 5th - 13th

Organizers: Marin Alexe, Enrique Cánovas, Celso de Mello Donega, Ivan Infante, Thomas Kirchartz, Maksym Kovalenko, Federico Rosei, Lukas Schmidt-Mende, Laurens Siebbeles, Peter Strasser, Teodor K Todorov, Roel van de Krol and Ulrike Woggon

Poster, Lige Liu, 130
Publication date: 14th June 2016

Organolead halide perovskites (CH₃NH₃PbX₃, X=Cl, Br, I) have attracted great attentions due to their interesting excitonic properties and the huge potential applications in optoelectronics.^[1,2] It has been learned that the physical properties and device performance can be strongly influenced by their size and dimensionality, especially for small-sized collodal nanocrystals. Recently, we developed the ligand-assisted reprecipitation synthesis and emulsion synthesis for fabricating brightly luminescent CH₃NH₃PbX₃ nanocrystals.^[3-5] Furthermore, we obtained colloidal nanocrystals with different morphologies including nanodots and nanoplatelets by varying the colloidal chemistry. Shape transformation from spherical dots to square nanoplatelets can be achieved by increasing the concentration of precursor solution. The resultant CH₃NH₃PbBr₃ nanoplatelets have an average thickness similar with the size of original dots and we also noticed a few of nanoplatelets with circular or square hole. These observations suggest that the shape transformation experienced a self-organization process, which is further illustrated by theoretical simulations.

References

[1] Tan, Z. K.; Moghaddam, R. S.; Lai, M. L.; Docampo, P.; Higler, R.; Deschler, F.; Price, M.; Sadhanala, A.; Pazos, L. M.; Credgington, D.; et al. Bright Light-Emitting Diodes Based on Organometal Halide Perovskite. Nat. Nanotechnol. 2014, 9, 687–692.

[2] Bai, Z. L.; Zhong, H. Z. Halide perovskite quantum dots: potential candidates for display technology. Science Bulletin. 2015, 60, 1622-1622.

[3] Niu, Y. W.; Zhang, F.; Bai, Z. L.; Dong, Y. P.; Yang, J.; Liu, R. B.; Zou, B. S.; Li, J. B.; Zhong, H. Z. Aggregation-Induced Emission Features of Organometal Halide Perovskites and Their Fluorescence Probe Applications. Adv. Opt. Mater. 2014, 3, 112–119.

[4] Zhang, F.; Zhong, H. Z.; Chen, C.; Wu, X. G.; Hu, X. M.; Huang, H. L.; Han, J. B.; Zou, B. S.; Dong, Y. P. Brightly Luminescent and Color-Tunable Colloidal CH₃NH₃PbX₃ (X=Br, I, Cl) Quantum Dots: Potential Alternatives for Display Technology. ACS Nano 2015, 9, 4533−4542.

[5] Huang, H. L.; Zhao, F. C.; Liu, L. G.; Zhang, F.; Wu, X. G.; Shi, L. J.; Zou, B. S.; Pei, Q. B.; Zhong, H. Z. Emulsion Synthesis of Size-Tunable CH₃NH₃PbBr₃ Quantum Dots: An Alternative Route toward Efficient Light-Emitting Diodes. ACS Appl. Mater. Interfaces 2015, 7, 28128–28133.

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