The Dalian Institute of Chemical Sciences, Chinese Academy of Sciences, prepared high-efficiency flexible perovskite solar modules

The cover image was produced by the Science Visualization Center of China Science Daily

Recently, the team of Yang Dong and Liu Shengzhong, researchers of the Solar Energy Research Department of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, used the strategy of oxygen vacancy defect filling in the electron transport layer to prepare the most efficient flexible perovskite solar cell modules reported in the literature. On April 30, 2023, the relevant research results were published in the journal Advanced Materials under the title “Highest-Efficiency Flexible Perovskite Solar Module by Interface Engineering for Efficient Charge-Transfer”.

Flexible perovskite solar cells have attracted wide attention due to their advantages of light weight, portability and high power-to-mass ratio. The research team has long been committed to the research of preparing high-quality perovskite absorbing layer and electron transport layer under low temperature conditions in flexible perovskite solar cells. Early development of a room temperature magnetron sputtering TiO2 electron transport layer (Energy Environ. Sci., 2015), Electron Transport Materials for Solid Ionic Liquids Prepared at Low Temperature (Adv. Mater. et al., 2016), prepared high-efficiency flexible perovskite solar cells. Subsequently, the team developed a dimethyl sulfide additive to delay the crystallization process of perovskite, improve the quality of perovskite absorbing layer, and again improve the efficiency of flexible perovskite solar cells (Adv. Mater.,2018)。

In this work, the team treated the SnO2 electron transport layer with oxygen and hydroxyl radicals generated by ultraviolet light irradiation, reducing oxygen vacancy defects in the SnO2 film. It is found that the energy level of SnO2 is shifted upward due to the introduction of hydroxyl groups to electrons, which is conducive to the export of electrons in perovskite. Hydroxyl groups can form hydrogen bonds between SnO2 and perovskite, improve interfacial contact, and provide channels for charge transport; After treatment, the wettability of SnO2 surface was effectively improved, which was more conducive to the preparation of large-area uniform perovskite films. Finally, the team prepared a flexible perovskite cell module with an area of 36.50 cm2 with an efficiency of 18.71%, which is the highest efficiency of flexible perovskite components reported in the literature. At the same time, the flexible perovskite component exhibits good mechanical properties, and the device can still maintain 83% of the original efficiency after bending 1000 times.

This work proposes a simple and effective interface processing method, which provides an effective way to promote the development of high-performance flexible perovskite cell modules.

This work was supported by the National Natural Science Foundation of China and other projects. (Source: Science Network)

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