Australian scientists claim breakthrough progress in perovskite stability
A world-leading perovskite solar cell developed by Australian scientists has passed a series of high-temperature and humidity tests, using low-cost solutions to overcome some of the challenges that hindered the technology from commercialization. Scientists do this by using simple, low-cost polymer-glass felt to suppress the decomposition of perovskite solar cells. A team of scientists led by the University of New South Wales (UNSW) and co-organized with the University of Sydney claimed to be in a global competition to develop durable perovskite solar cells (often referred to as "next generation" solar photovoltaic technology) Among them, they are at the forefront of the world. In an important step towards commercialization, the group announced that its perovskite has passed the strict International Electrotechnical Commission (IEC) high temperature and humidity test standards. These scientists have been working on metal halide perovskite solar cells, and have achieved unprecedented progress in just 10 years, increasing the battery's power conversion efficiency from 3.8% to 25.2%. In comparison, it took scientists about 40 years to make the conversion rate of silicon cells reach 26.7%. John Hooke, the first chairman of the Department of Nanoscience at the University of Sydney, said: "They are very cheap, 500 times thinner than silicon, so they are extremely flexible and ultra-light. They also have huge energy-enabling properties and solar The conversion rate is higher. " However, unprotected perovskite batteries are not as durable as silicon-based batteries, so they are not commercially viable. In order to get out of the laboratory, the perovskite needs to withstand long-term environmental stress caused by humidity, high temperature and light. Professor Ho-Baillie said: "Perovskite batteries need to meet current commercial standards. This is where our research is exciting. We have confirmed that we can greatly improve their thermal stability." Simple glass and polymer solutions The study-co-authored by 14 scientists (mostly Australian scientists) and now published in the journal Science-elaborated on the low-cost solution proposed by the research team. The researchers used gas chromatography-mass spectrometry (GC-MS) to identify the characteristic volatile products and decomposition pathways of heat-stressed hybrid perovskites commonly used in high-performance batteries. Using this method, they found that organic-inorganic perovskite solar cell packages encapsulated with simple, low-cost polyisobutylene (synthetic rubber) -based or polyolefin-based polymer-glass compositions have excellent durability beyond IEC61215: 2016 Requirements for humid heat and freeze test. The researchers were able to confirm that the hermetic packaging of the low-cost polymer glass laminate structure effectively suppressed the permeation of the perovskite (the process leading to its decomposition). With this packaging scheme, CH3NH3 (MA) solar cells containing polycationic polyhalide perovskites have undergone more than 1800 hours of damp heat testing and 75 cycles of 30 wet freezing tests, exceeding the IEC61215: 2016 standard for the first time. The requirements far exceeded the expectations of the team. Professor Ho-Baillie said: "Our research also has an exciting result, which is that we can achieve the stability of perovskite batteries under the harsh environmental test conditions of the International Electrotechnical Commission. These batteries not only pass the thermal cycle The test also exceeded the requirements of the humid heat and freeze test. " These tests can help determine whether the solar cell module can withstand the impact of outdoor operating conditions by exposing it to multiple temperature cycles between -40 degrees and 85 degrees and 85% relative humidity. "These results are particularly important because the perovskite solar cells used in this study contain MA cations that are known to have lower thermal stability. The research paper concludes:" Nevertheless, these cells still passed the most stringent Wet freezing test for damp heat stress. " Medical Face Mask,Protective Dust Mask,3 Ply Face Mask,3 Ply Disposable Face Mask KUTA TECHNOLOGY INDUSTRY CO.,LIMITED , https://www.kutasureblue.com