TU Dresden research team develops solar cell with »phase heterojunction«

A »novel concept for solar cells« has been presented by a research group at the Integrated Center for Applied Physics and Photonic Materials (IAPP) and the Center for Advancing Electronics Dresden (cfaed) at Dresden, Germany University of Technology (TU Dresden). The group’s results, published in the journal Nature Energy, describe a »phase-heterojunction« in a perovskite cell with multiple pn junctions.
While heterojunction cells usually combine differently doped semiconductor materials, the TU Dresden team used the same material – cesium-lead-iodide perovskite – in different phases. »The optical and electrical properties of cesium-lead-iodide in its beta and gamma phase are different from each other,« explains the group’s leader, Yana Vaynzof. The phase-heterojunction was created by depositing the material in the gamma phase on top of that in the beta phase.
The efficiencies achieved have already exceeded 20 percent. The members of the group see advantages in particular in a potentially comparatively uncomplicated production process. It is hoped that this can also be transferred to other material systems and semiconductor components.

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