New class of solar cells, using lead-free perovskite materials

ScienceDaily | 1/20/2019 | Staff
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A recent study, led by Professor Tae-Hyuk Kwon in the School of Natural Science at UNIST has taken a major step toward the development of a new generation of solar cells, using lead-free perovskites. With its promising electronic properties, the new perovskite material has been demonstrated to function as a charge regenerator with dye-sensitized solar cells, thus enhancing both the overall efficiency and stability. Published in the November 2018 issue of Advanced Materials, their findings will open new possibilities for the application of lead-free perovskites in solar cells.

Among the various alternatives to lead, the research team used the vacancy-ordered double perovskite (Cs2SnI6). Despite their promising outlook, the surface states of Cs2SnI6 and their function remain largely unclear. Thus, a comprehensive study is necessary to clarify these features of Cs2SnI6 for the future design of Cs2SnI6-based devices.

Work - Team - Charge - Transfer - Mechanism

Through this work, the team examined the charge transfer mechanism of Cs2SnI6 with the aim of clarifying the function of its surface state. For this purpose, a 3-electrode system was developed to observe charge transfer through the surface state of Cs2SnI6. Cyclic voltammetry and Mott-Schottky analyses were also used to probe the surface state of Cs2SnI6, whose potential is related to its bandgap.

Their analysis demonstrated that the surface state of Cs2SnI6 is highly redox active and can be effectively charged/discharged in the presence of iodide redox mediators. Besides, the preparation...
(Excerpt) Read more at: ScienceDaily
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