New progress has been made in the research of high

New progress has been made in the research of high-performance perovskite solar cells

On the 15th, the reporter learned from Kunming University of Science and Technology that the team of Professor Chen Jiangzhao and Professor He Dongmei from the School of Materials Science and Engineering of the university has made important progress in the field of high-performance perovskite solar cells. The relevant results were recently published in the international top materials journal "Advanced Materials" under the title of "Universal Ion Migration Suppression Strategy to Achieve High-Performance Perovskite Solar Cells".

Metal halide perovskite solar cells are solar cells that use perovskite-type organic metal halide semiconductors as light-absorbing materials. Because of its high photoelectric conversion efficiency and good stability, it has received widespread attention in the photovoltaic field. At present, this new type of solar cell has achieved a certified photoelectric conversion efficiency of up to 27%, which is comparable to the efficiency of single-crystal silicon cells. However, the poor long-term working stability poses a severe challenge to the commercialization of perovskite photovoltaic technology. Each functional layer and its interface in the device are closely related to the long-term stability of the battery.

In view of this, the team of Chen Jiangzhao and He Dongmei reported a universal ion migration inhibition strategy to stabilize multiple functional layers, and simultaneously inhibit the migration of multiple chemical species through the host-guest interaction of cuparene supramolecules. The researchers achieved an efficiency of 26.01% based on the 4-tert-butyl cup[8]arene doped formal cell prepared by the two-step method, which is the world record efficiency reported for planar formal cells based on titanium dioxide. The new inverse perovskite solar cell achieved an efficiency of 27.18%, which is the highest efficiency in the research on perovskite cells prepared by vacuum flash evaporation technology.

In addition, the unencapsulated new inverse cell can still maintain more than 90% of its initial efficiency after continuous operation at the maximum power point for 1200 hours, and the efficiency remains above 95% of the initial value after being stored in an environment with a relative humidity of 30% for 2800 hours. After heat aging at 65°C for 1500 hours, the efficiency remains above 90% of the initial value.

This innovative research provides an effective method to solve the instability problem of perovskite photovoltaic devices and other perovskite-based optoelectronic devices, and provides a universal strategy for inhibiting ion migration in perovskite solar cells, which is expected to promote the industrialization of perovskite photovoltaic technology.