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• 作者：Jun Dai ; Yongping Fu ; Lydia H. Manger ; Morgan T. Rea ; Leekyoung Hwang ; Randall H. Goldsmith ; Song Jin
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：December 15, 2016
• 年：2016
• 卷：7
• 期：24
• 页码：5036-5043
• 全文大小：557K
• ISSN：1948-7185

文摘

Organic–inorganic lead iodide perovskites are efficient materials for photovoltaics and light-emitting diodes. We report carrier decay dynamics of nanorods of mixed cation formamidinium and methylammonium lead iodide perovskites [HC(NH₂)₂]_1–x[CH₃NH₃]_xPbI₃ (FA_1–xMA_xPbI₃) synthesized through a simple solution method. The structure and FA/MA composition ratio of the single-crystal FA_1–xMA_xPbI₃ nanorods are fully characterized, which shows that the mixed cation FA_1–xMA_xPbI₃ nanorods are stabilized in the perovskite structure. The photoluminescence (PL) emission from FA_1–xMA_xPbI₃ nanorods continuously shifts from 821 to 782 nm as the MA ratio (x) increases from 0 to 1 and is shown to be inhomogeneously broadened. Time-resolved PL from individual FA_1–xMA_xPbI₃ nanorods demonstrates that lifetimes of mixed cation FA_1–xMA_xPbI₃ nanorods are longer than those of the pure FAPbI₃ or MAPbI₃ nanorods, and the FA_0.4MA_0.6PbI₃ displays the longest average PL lifetime of about 2 μs. These results suggest that mixed cation FA_1–xMA_xPbI₃ perovskites are promising for high-efficiency photovoltaics and other optoelectronic applications.