Lead-Free Perovskites Boost Generation Of Electric Current

Lead-based perovskites are quite promising in applications of large-scale photovoltaic technology. However, toxicity is one of the crucial issues in these materials.

In the search for Lead-free perovskite, UNIST scientists have taken a major step forward toward a new generation of solar cells. They have developed new perovskite material that works as a charge regenerator with dye‐sensitized solar cells and have higher efficiency and stability.

Scientists used the vacancy‐ordered double perovskite (Cs2SnI6). They primarily examined the charge transfer mechanism of Cs2SnI6 with the aim of clarifying the function of its surface state.

For this reason, a 3‐electrode system was produced to observe charge exchange through the surface state of Cs2SnI6.  “Due to a high volume of electrical charges in organic dyes that show high connectivity with the surface state of Cs2SnI6, more electric current was generated,” said Byung-Man Kim from the Department of Chemistry at UNIST. “Consequently, Cs2SnI6 shows efficient charge transfer with a thermodynamically favorable charge acceptor level, achieving a 79% enhancement in the photocurrent density compared with that of a conventional liquid electrolyte.”

Source: http://news.unist.ac.kr/

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