Compositional Engineering for Thermally Stable, Highly Efficient Perovskite Solar Cells Exceeding 20% Power Conversion Efficiency with 85 °C/85% 1000 h Stability

• DOI: 10.1002/adma.201806823
• Publication Date: 2019-01-11T14:49:03Z
• Authors: Taisuke Matsui; Teruaki Yamamoto; Takashi Nishihara; Ryosuke Morisawa; Tomoyasu Yokoyama; Takashi Sekiguchi; Takayuki Negami
• Keywords: Thermal Stability; Limiting; Electrical efficiency

Perovskite solar cells have received great attention because of their rapid progress in efficiency, with a present certified highest efficiency 23.3%. Achieving both high and thermal stability is one the biggest challenges currently limiting perovskite devices displaying at temperature frequently suffer from marked decrease efficiency. In this report, relationship between composition device examined. It revealed that Rb can suppress growth PbI2 even under -rich conditions decreasing Br ratio absorber layer prevent generation unwanted RbBr-based aggregations. The optimized achieved by engineering exhibits 92% power conversion retention stress test conducted 85 °C/85% relative humidity (RH) according to an international standard (IEC 61215) while exceeding 20% (certified 20.8% 1 cm2 ). These results reveal potential for practical use near future.