Perovskite solar cells achieve energy conversion efficiency milestone

Technology News |
By eeNews Europe

A research group led by Dr. Liyuan Han, the leader of the Photovoltaic Materials Unit at the National Institute for Materials Science (NIMS, Sukekatsu Ushioda, president) achieved 15% energy conversion efficiency in perovskite solar cells for the first time in the world as officially recognized by an international public test center.

The largest conversion efficiencies in perovskite solar cells reported so far had been measured using small-sized cells (about 0.1 cm2). A conversion efficiency of 20.1% has been reported previously, but the measurement error was large in that study due to the small-sized cells used (0.0955 cm2) and the report did not present the measurement method. To steadily advance R&D of perovskite solar cells based on reliable data, it is key issue to measure the conversion efficiencies at international public test center.

The research group attained increased conversion efficiency and reproducibility of perovskite solar cells by controlling morphology of perovskite layer with new fabricating method. In addition, since the conventional material used for a charge carrier transport layer is hydrophilic, the conversion efficiency of the cell deteriorates rapidly. The researchers developed a new charge transport material which shows hydrophobicity and high carrier mobility, and improved the stability of perovskite solar cells with this new material. Based on the results, the researchers expanded the solar cell to more than 1 cm square and improved the method to create the device. As a result, the group achieved 15% conversion efficiency in perovskite solar cells for the first time in the world certified by the international public test center (Calibration, Standards and Measurement Team at the Research Center for Photovoltaics, National Institute of Advanced Industrial Science and Technology).

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