Bication lead iodide 2D perovskite component to stabilize inorganic α-CsPbI<sub>3</sub> perovskite phase for high-efficiency solar cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 28975149.
- Also identified by DOI 10.1126/sciadv.1700841 and PMC identifier 5621977.
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Abstract
Among various all-inorganic halide perovskites exhibiting better stability than organic-inorganic halide perovskites, α-CsPbI<sub>3</sub> with the most suitable band gap for tandem solar cell application faces an issue of phase instability under ambient conditions. We discovered that a small amount of two-dimensional (2D) EDAPbI<sub>4</sub> perovskite containing the ethylenediamine (EDA) cation stabilizes the α-CsPbI<sub>3</sub> to avoid the undesirable formation of the nonperovskite δ phase. Moreover, not only the 2D perovskite of EDAPbI<sub>4</sub> facilitate the formation of α-CsPbI<sub>3</sub> perovskite films exhibiting high phase stability at room temperature for months and at 100°C for >150 hours but also the α-CsPbI<sub>3</sub> perovskite solar cells (PSCs) display highly reproducible efficiency of 11.8%, a record for all-inorganic lead halide PSCs. Therefore, using the bication EDA presents a novel and promising strategy to design all-inorganic lead halide PSCs with high performance and reliability.