Chang prepared solar cells featuring methylammonium tin iodide, CH3NH3SnI3, an air-sensitive lead perovskite analog that is normally incompatible with other solar-cell components (Nat. Photonics 2014, DOI: 10.1038/nphoton.2014.82). The team adjusted its fabrication methods to work around the air-sensitivity problem and achieved sunlight-to-electricity conversion efficiencies of nearly 6% in prototype devices. They also discovered that the devices’ absorption profiles can further be tuned to capture more of the visible portion of the spectrum by using mixed iodide-bromide perovskites. Kanatzidis believes that with further study the efficiencies can easily be boosted to 15% to match values already achieved using lead perovskites. /articles/92/i19/Lead-Free-Perovskite-Solar-Cells.html 20140512 For low-cost photovoltaics, an ammonium tin halide salt offers a lead-free alternative to current perovskite materials Concentrates 92 19 /magazine/92/09219.html /departments/.html /collections/con.html Lead-Free Perovskite Solar Cells Science & Technology Mitch Jacoby This SEM image depicts the layered structure of a tin perovskite-based solar cell.
by Mitch Jacoby |
May 12, 2014