An international team investigated repeated thermal stress on metalhale perovskiet solar cells and has proposed strategies to increase the resistance to demolition effects of day cycles or geographical conditions.
A group of researchers led by Helmholtz-Zentrum Berlin (HZB) in Germany and the Chinese Henan University has been investigating thermal stress cycles, which reflects daily cycles, on the demolition of metal halide perovskite solar cells.
The results and proposed solutions appear in a perspective paper, “” “Resilience routes for Halide Perovskiet Photovoltaïschen under Temperature Cycling‘Published by Nature reviews Materials.
By subjecting perovskite solar cells to repeated temperature changes – the cells were cooled to minus 150 ° C and then heated to plus 150 ° C, the team was able to change the changes in the microstructure of the perovskiet layer and its interactions with the layers of the cell Stack to be studied. The group noted varied thermal behavior of the different materials. In addition, local phase transitions and diffusion of elements in adjacent layers were observed.
It concluded that thermal stress is the “decisive factor” in the demolition of metalhale perovskites. Although incapherity can effectively protect the cells against moisture and atmospheric oxygen, it has been pointed out, the devices are still exposed to daily temperature variations throughout the year. In the desert, for example, the temperatures in the solar cells can vary from minus 40 ° C to Plus 100 C.
In order to make the perovskiet and adjacent layers more resilient for thermal stress, the researchers proposed to “improve the crystallinity of the material” or use buffer layers to illuminate “thermal voltage between the intermediate layer”.
They also emphasized the importance of uniform tests to facilitate the comparison between different studies, as an introduction to the proposal of a uniform approach to evaluating stability under temperature cycles.
The researchers of the aforementioned institutions were accompanied by scientist employees of the University of Oxford, Università degli Studi di Cagliari, Henan Normal University, Swiss Federal Institute of Technology (EPFL), Southeast University, University of Stuttgart, Universidad de Valencia, IK5-Photodaics . Forschungszentrum Jülich, Bielefeld University and University of the Basque Country UPV/EHU.
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