Shenzhen Advanced Institute made progress in the development of flexible perovskite solar cells

Recently, the Nano Regulation and Biomechanics Laboratory of the Institute of Medical Technology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences has made new progress in the development of flexible perovskite solar cells. Relevant research results are based on Highly flexible, robust, stable and high efficiency perovskite solar cells enabled by van der Waals epitaxy on mica substrate. "Mining Solar Cells"), published online in "Nano Energy" (Nano Energy, 2019, 60, 476-484).

With the rapid development of the smart electronics industry, flexible wearable electronics has become a hotspot in the future development of electronic components, and power supply is an important part of it. At present, power supplies have greater restrictions on the outdoor use, large area fit and safety of wearable electronics. The demand for wearable electronic textiles continues to increase, so flexible solar cells have received more and more attention. Perovskite solar cells are widely used in the manufacture of flexible cells due to their high efficiency, low cost, and flexible manufacturing methods. The flexible substrate is a key factor that determines the performance of flexible perovskite solar cells. At present, the substrates used for the preparation of flexible devices are mainly polymer substrates. When the critical bending radius is reached, the transparent conductive layer breaks, causing serious degradation of the photoelectric performance. At the same time, water molecules easily pass through the polymer substrate, affecting Battery mechanical and long-term stability of perovskite.

In order to solve the above problems, a joint research team of the Nano Regulation and Biomechanics Laboratory, Shijiazhuang Railway University and Taiwan Jiaotong University has developed a highly flexible, stable and efficient perovskite solar cell (PSC) on a transparent mica substrate. The best photoelectric conversion efficiency (PCE) is 18.0%; the bending radius is as small as 5mm, which maintains 91.7% of the original efficiency after 5000 bending cycles. Its excellent performance is mainly due to the van der Waals force between the mica layers reduces the mechanical constraints of the substrate on the PSC device, so that it has a higher mechanical bending performance. This work provides new ideas for the research of flexible batteries.

This work was supported by the Shenzhen Peacock Project.

Figure (a) is a photo of a flexible battery; Figure (b) is a TEM photo of a device cross-section; Figure (c) is a battery performance JV curve; Figure (d) is a device bending durability test result; Figure (e) is a device fatigue test result Figure (f) is the damp heat test junction (85 ° C, 85% RH).