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According to the survey, China's building energy consumption accounts for more than 40% of the total energy consumption of the whole society. Traditional silicon-based solar panels are dedicated to turning roofs into solar generators. However, for urban areas with huge energy demand and dense population, they need to collect energy for skyscrapers, and the roof area is very limited.
Solar power windows can replace the glass windows and glass curtain walls that do not have the power generation function of buildings, and transform the windows and curtain walls of high-rise buildings into solar power generation devices. The electric energy produced will greatly reduce the energy consumption of buildings and realize the goal of "zero carbon" buildings.
In recent years, Professor Deng Zhengtao's team of School of modern engineering and Applied Sciences of Nanjing University has been committed to the basic research and industrial application of new luminescent quantum dot materials. Especially in the two directions of wide color gamut display devices and power generation windows, around the bottleneck problem of quantum dots in practical application, a series of progress has been made in the application form, performance improvement and aging resistance of products.
Recently, a new triphenylphosphine treatment method was used to prepare the near-infrared emission cesium lead iodine quantum dot solar power window prototype device with high photoluminescence quantum efficiency, low reabsorption and high stability.
In March 2020, the relevant achievements were published online in the international top Chemical Journal angelwandte Chemistry International Edition and German Applied Chemistry (DOI: 10.1002 / 201911638) under the title of "efficient and stable thin film luminescent solar concentrators enabled by near infrared emission perovskite nanocrystals".
A part of the transmitted light is absorbed by the cesium, lead and iodine quantum dots dispersed in the surface layer of high transparent polymer sheet, which can realize efficient fluorescence conversion and re emit near-infrared light. The fluorescence wavelength is 700 nm, the quantum yield of fluorescence is 99.4 ± 0.4%, the half peak width of fluorescence emission is very narrow, only 75 MeV (30 nm).
In this work, compared with the devices prepared by traditional quantum dots, the water resistance and light degradation resistance of the devices are greatly improved. Even in the case of 30 days immersion in water and strong light irradiation, it still maintains good performance. Near infrared light passes through the optical waveguide to the commercial silicon-based solar cell installed on the side. The 75 square centimeter prototype infrared concentrator achieved a high optical conversion efficiency of 3.1%. This achievement has laid a foundation for the practical application of luminescent quantum dots in solar power windows.
The research team predicts that in the near future, through continuous optimization of luminescent quantum dot materials, almost transparent windows and curtain walls will become efficient solar power generation devices, which can provide power for air conditioners in summer and water heaters in winter, and finally achieve the goal of intelligent "zero carbon" buildings.
The school of modern engineering and Applied Sciences of Nanjing University is the first unit of this paper; the corresponding author of this paper is Professor Deng Zhengtao of the school of modern engineering and Applied Sciences; the doctoral student Wu Jiajing under the guidance is the first author of this paper. In the process of completion, the work was guided and supported by Professor Nie Shuming, with the help of Professor Zhang Chen in polymer materials and Professor Tan Hairen in device testing. This work was supported by Jiangsu Ontario International Cooperation Project (bz2018008), national "overseas high level Talents Program", Jiangsu "entrepreneurship and Innovation Talents Program" and Jiangsu nanotechnology Key Laboratory.
Article source: PV tech daily PV news
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