The next generation of photovoltaics, semiconductors and LEDs can be made using perovskites – an exciting and flexible nanomaterial with crystal structure.Perovskites have already shown similar efficacy of silicon, are cheaper to make, and incorporates harvested bandgap, meaning that the ability to absorb, exhibit or behave can be modified to suit different purposes.Generally, Water is stored as far away as possible during the process of creating perovskites. The presence of moisture can lead to damage to objects, causing them to crack quickly when used on the fence.
That is why perovskite scientific research is usually done by spin coating in the closed area of the box of nitrogen gloves.Now, however, members of the ARC Center of Excellence in Exciton Science have found an easy way to control the growth of phase-pure perovskite crystals by using water as a positive. This liquid-based process operates at room temperature, so the handling method is always more expensive.Led by researchers from Monash University, the team found that by changing the water level in the solvent during the early stages of the process, they could choose to grow different types of perovskite crystals, and structures with different purposes.
WATER
Corresponding author Dr. Wenxin Mao of Monash University said: “By carefully adjusting the water level in the precursor solution, we have seen the precise control of certain sections of perovskite.Computational and thermodynamic analyzes conducted by colleagues at the University of Sydney identified that the combination of lead ions with bromide in the precursor solution was an important factor in determining which types of crystals were formed.Leading author Qingdong Lin, a PhD student at Monash University, said: “We now understand the internal machinery and function of water within the precursor solution. By doing so we can continue to use water to control the crystallization process.”
Test sample
To demonstrate the quality of the final product, crystals produced in this way are combined with back-contact electrodes using nanofabrication to create X-ray detection devices.This test sample was made at the same level as commercial X-ray detectors currently used in real-world settings, such as medical imaging and Geiger calculators, as well as ineffective perovskite X-ray detectors developed using slower, more sophisticated production methods.Wenxin said: “We compared commercial X-ray detectors with other types of perovskite and have a very good reaction and sensitivity to X-rays. Overall this project shows that we have found a clever way to control the inorganic perovskite. Single crystals.”The method is flexible and flexible and does not require a very different environment or method of use.”As well as solar cells, X-ray machines and LEDs, perovskites created in this way may be useful in detecting UV light, laser, and solar concentrators.
Source Journal Reference:Qingdong Lin, Stefano Bernardi, Babar Shabbir, QingdongOu, Mingchao Wang, Wenping Yin, Shiqi Liu, Anthony S. R. Chesman, Sebastian O. Fürer, Guangyuan Si, Nikhil Medhekar, Jacek Jasieniak, Asaph Widmer‐Cooper, Wenxin Mao, Udo Bach. Phase‐Control of Single‐Crystalline Inorganic Halide Perovskites via Molecular Coordination Engineering. Advanced Functional Materials, 2021; 32 (16): 2109442 DOI: 10.1002/adfm.202109442
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