Publication date: 22nd July 2026
Light management is one of the key strategies for pushing the efficiency of perovskite solar cells. While smoother perovskite surface layers are desirable for improving charge transfer with the overlying charge transport layer, increasing the contact interface area also offers enhanced charge transport.
To address this, we have developed a surface patterning technique for perovskite and its overlying charge transport layer using a picosecond pulsed laser. This contactless, fast and highlty precise patterning technique overcomes the challenges of expensive fabrication processes such as masking and lithography, completing the process in a fraction of a second.
In this work, we report an increased open circuit voltage from 1.06 V to 1.10 V for a comparable thickness. Additionally, by controlling the laser fluence, we demonstrate control over etch depth ranging from 30 to 100 nm across different periodicities. This work opens the possibility of exploring light-matter interactions in halide-perovskites based optoelectronic devices.
We gratefully acknowledge the GRK 2642 and ER LOCAL heat for their funding. We also thank ZAQ for the LPKF laser tool
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