April 18 (Renewables Now) - The US government’s National Renewable Energy Laboratory (NREL) has developed a new perovskite ink with a processing window as long as eight minutes for the scalable production of perovskite thin films.
Using blade-coated absorbers, the team of scientists made a four-cell perovskite module of 12.6 sq cm with a stabilised efficiency of 13.3%, they say in a release last week. The paper “Perovskite ink with wide processing window for scalable high-efficiency solar cells” has been published in Nature Energy.
The formula for the precursor perovskite ink included a chlorine-containing methylammonium lead iodide precursor along with solvent tuning, coupled with an antisolvent, which could be deposited onto the substrate by either spin-coating or blade-coating methods. NREL said blade-coating is preferred by manufacturers since it can be scaled up.
The scientists also tested two types of precursor ink, one containing excess methylammonium iodide (MAI) and another with added methylammonium chloride (MACI). The second one was able to cut to roughly a minute the length of heat treatment required by perovskites, as compared to 10 minutes for the MAI solution.