Kwangwoon University's 

Nano Device Application Research Center (Professors Hyunho Lee and Sang-Shin Lee)

Applied Metasurface-Based Blue blocking Filter to 

Improve the Lifespan of Perovskite Solar Cells

 - The light stability of perovskite solar cells was greatly improved after applying a metasurface-based blue light blocking filter

 - The paper (IF:3.8) was published in Optics Express, an internationally renowned optical journal

 ＜(Left to Right) Beomhee Yoon, Researcher of Integrated Master’s and Doctorate Program, Professor Hyunho Lee, Professor Sang-Shin Lee＞

The research team of Kwangwoon University's Nanodevice Application Research Center (a joint research team of Professors Hyunho Lee and Sang-Shin Lee of the Department of Electronic Engineering) succeeded in significantly improving the optical stability of organic/inorganic perovskite solar cells by applying a metasurface-based blue light blocking filter.

Organic-inorganic hybrid perovskite solar cells are being studied as next-generation solar cells based on their high photoactivity coefficient and solution process. However, the slight bonding force between the organic part constituting the perovskite and the halide elements is pointed out as the cause of weakening the perovskite structure against oxygen, moisture, and ultraviolet rays in the air. Deterioration of devices due to high-energy light such as ultraviolet rays is an essential factor to be solved for the successful commercialization of perovskite solar cells. It is essential to understand the systematic photodegradation mechanism for perovskite.

In this study, red (610 nm ~ 800 nm), green (500 nm ~ 590 nm), and blue (300 nm ~ 500 nm) color filters were used for scanning electron microscope and time-of-flight secondary ion mass spectrometry analysis. The light degradation mechanism of perovskite solar cells was investigated. In addition, to suppress the deterioration of the device by blue light, a blue light blocking filter that can selectively block light in the 400-500 nm range was designed using a multilayer inorganic thin-film metasurface composed of SiO2 and TiO2. As a result, the perovskite solar cell to which the blue light blocking filter is applied showed stability that can recover more than 30% of power compared to the conventional solar cell.

The research team expects that the developed metasurface-based blue light blocking filter will be utilized as an application technology to improve the light stability of perovskite solar cells. This research was conducted with support from the University Focused Research Institute (2018R1A6A1A03025242, 2022R1F1A1066526) and Kwangwoon University. The research results were published in Optics Express, an optical journal (Optics Express, IF:3.894, JCR 19.7%).

The Research Publishment: https://doi.org/10.1364/OE.465848

 ＜The structure of the metasurface-based blue light blocking filter and the performance of the perovskite solar cell to which it is applied＞