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MemberSeptember 10, 2021 at 9:28 pm
To observe the charge transport within the solar cell, the Mainz-based researchers cleaved the cell in the middle and polished the broken surface until it was smooth using a finely focussed ion beam. With the help of Kelvin probe force microscopy, they mapped the electrical potential in each layer of the solar cell. From this potential map, the researchers could derive the field distribution and thus the charge transport through the different layers of the cell.
“We could for the first time correlate the charge distribution with the individual material layers in the cell”, says Rüdiger Berger. “The charge transport jamming of positive charges in the illuminated perovskite layer tells us that the transport through the hole conductor currently constitutes the bottleneck for the efficiency of the solar cell” If a more effective hole conductor could be used, the efficiency of the perovskite solar cells could be increased well above the 20% mark and thus offer a genuine alternative to the conventional silicon solar cells.
Publication: Victor W. Bergmann, et al., “Real-space observation of unbalanced charge distribution inside a perovskite-sensitized solar cell,” Nature Communications 5, Article number: 5001;