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Compositional Engineering for Thermally Stable, Highly Efficient Perovskite Solar Cells Exceeding 20% Power Conversion Efficiency with 85 °C/85% 1000 h Stability
Author(s) -
Matsui Taisuke,
Yamamoto Teruaki,
Nishihara Takashi,
Morisawa Ryosuke,
Yokoyama Tomoyasu,
Sekiguchi Takashi,
Negami Takayuki
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201806823
Subject(s) - energy conversion efficiency , perovskite (structure) , materials science , thermal stability , relative humidity , limiting , electrical efficiency , chemical engineering , optoelectronics , nanotechnology , power (physics) , meteorology , thermodynamics , mechanical engineering , physics , engineering
Perovskite solar cells have received great attention because of their rapid progress in efficiency, with a present certified highest efficiency of 23.3%. Achieving both high efficiency and high thermal stability is one of the biggest challenges currently limiting perovskite solar cells because devices displaying stability at high temperature frequently suffer from a marked decrease of efficiency. In this report, the relationship between perovskite composition and device thermal stability is examined. It is revealed that Rb can suppress the growth of PbI 2 even under PbI 2 ‐rich conditions and decreasing the Br ratio in the perovskite absorber layer can prevent the generation of unwanted RbBr‐based aggregations. The optimized device achieved by engineering perovskite composition exhibits 92% power conversion efficiency retention in a stress test conducted at 85 °C/85% relative humidity (RH) according to an international standard (IEC 61215) while exceeding 20% power conversion efficiency (certified efficiency of 20.8% at 1 cm 2 ). These results reveal the great potential for the practical use of perovskite solar cells in the near future.