2D Halide Perovskites are a revolutionary advancement in semiconductor technology. They hold great promise in applications such as solar cells and LEDs.
Scientists led by Associate Professor Nripan Matthews at NTU’s School of Materials Science and Engineering have successfully synthesized these four revolutionary types of perovskites. Ayan Zumekenov, the lead author and a research fellow at NTU, developed a new method for synthesising perovskites based on methylammonium using dimethyl carbonate, an environmentally friendly solvent.
The researchers discovered that by changing the ratios of dimethylcarbonate and methylammonium in the material, they were able to modify the band gaps. The color of the material is determined by the band gap. It represents the amount of energy required for an electron in its bound state to be able to achieve conductivity.
It is important to be able to control the gap width in perovskites. Newly developed 2D-halide perovskites demonstrate an “electronic” switchable property.
Researchers discovered that one perovskite can switch between colors, going from orange to a red color when heated to 80 degrees Celsius. It then returns to the original color after cooling to room temperature.
Scientists have shown that the color changing reaction can be repeated up to 25 times. The thermochromic switch phenomenon opens up new possibilities for smart coatings, heat-sensitive pigments, and other applications.
Researchers are confident that the breakthrough they have made will result in technological advances involving 2D perovskites, both optoelectronics as well as other areas.
Reference to Journal:
- Ayan A. Zhumekenov, Yongxin Li, Yifan Zhou, Natalia Yantara, Anil Kanwat, Benny Febriansyah, Darrell Jun Jie Tay, Hesham R. Abuzeid, Yeow Boon Tay, Emha Bayu Miftahullatif, Kedar Hippalgaonkar, Sumod A. Pullarkat, Jun Yin, Nripan Mathews. Solvent-Templated Methylammonium Based Ruddlesden Popper Perovskites With Short Interlayer Distances. Journal of the American Chemical Society 2024, DOI: 10.1021/jacs.3c12891.
