Perovskite solar cells and large area modules (100 cm~2) based on an air flow-assisted PbI_2 blade coating deposition process

摘要

The present work focuses on research into alternative and more scalable processes for organometal halide perovskite layer deposition. We compare solar cells fabricated by sequential step deposition of the perovskite layer, where the PbI_2 film is deposited using either blade or spin coating. By controlling the crystallization of the PbI_2 with air flow, a highly compact layer was obtained with both techniques. The final perovskite structure was then obtained by dipping the substrates in a methylammonium iodide solution. The study and the consequent optimization of the blade coating process and the dipping time, led us to achieve 10 mm~2 solar cells with a maximum efficiency of 13.3% and an average efficiency of 12.1%. To prove the scalability of the process, series connected modules were fabricated containing blade coated PbI_2 films. The films were laser patterned with a CO_2 laser before being dipped in the methyl-amine iodide solution. A module efficiency of 10.4% was obtained for a 10.1 cm~2 active area. An efficiency of 4.3% was measured for a module area of 100 cm~2.