Perovskite Test: A High Throughput Method to Screen Ambient Encapsulation Conditions

Over the past decade, the power conversion efficiency of lead halide perovskite-based solar cells has increased at an unprecedented rate such that it is now over 25%. Nevertheless, water facilitates one of the prominent degradation mechanisms of perovskites requiring strong encapsulation. To evaluate rapidly the effectiveness of encapsulation materials and design, an optical test of encapsulation procedures with simple sample fabrication in air is developed. The glass-glass samples of perovskite layers sealed with different thicknesses of a UV-curing adhesive are fabricated. The analysis of the test data allows identification of gas permeation mechanisms from the edge of the device and it is found that one of the major permeation pathways is on the interfaces between the adhesive and the glass substrate and it depends on the adhesive thickness.