Overview
- Researchers at HZB and the University of Potsdam quantified mobile ion densities across four perovskite compositions and found the lowest levels in tin FASnI3 made with an alternative solvent.
- Tin-based FASnI3 processed with a DMF–DMI solvent showed about ten times fewer mobile ions than a lead-based perovskite benchmark.
- Devices using the solvent-engineered tin perovskite maintained excellent operational stability for more than 600 hours and exhibited an intrinsic degradation time five times slower than lead-based cells.
- The team attributes the improvement to avoiding tin oxidation associated with the conventional DMSO solvent by switching to a DMF–DMI system.
- The materials were produced at HZB’s Hysprint lab and the findings, published in ACS Energy Letters, come as researchers note tin devices currently trail in efficiency even as theory suggests they could surpass lead.