Incorporation of rubidium cations into perovskite solar cells improves photovoltaic performance

作者：Michael Saliba, Taisuke Matsui, Konrad Domanski, Ji‐Youn Seo, Amita Ummadisingu, S. M. Zakeeruddin, Juan‐Pablo Correa‐Baena, W. Tress, A. Abate, A. Hagfeldt, M. Graetzel · 发表于：Science · 年份：2016 · DOI：10.1126/science.aah5557 · 被引用次数：3306 · 研究领域：Medicine、Chemistry

Improving the stability of perovskite solar cells Inorganic-organic perovskite solar cells have poor long-term stability because ultraviolet light and humidity degrade these materials. Bella et al. show that coating the cells with a water-proof fluorinated polymer that contains pigments to absorb ultraviolet light and re-emit it in the visible range can boost cell efficiency and limit photodegradation. The performance and stability of inorganic-organic perovskite solar cells are also limited by the size of the cations required for forming a correct lattice. Saliba et al. show that the rubidium cation, which is too small to form a perovskite by itself, can form a lattice with cesium and organic cations. Solar cells based on these materials have efficiencies exceeding 20% for over 500 hours if given environmental protection by a polymer coating. Science, this issue pp. 203 and 206 The seemingly too small rubidium cation was successfully integrated into perovskite solar cells. All of the cations currently used in perovskite solar cells abide by the tolerance factor for incorporation into the lattice. We show that the small and oxidation-stable rubidium cation (Rb+) can be embedded into a “cation cascade” to create perovskite materials with excellent material properties. We achieved stabilized efficiencies of up to 21.6% (average value, 20.2%) on small areas (and a stabilized 19.0% on a cell 0.5 square centimeters in area) as well as an electroluminescence of 3.8%. The open-circu...