High Photoluminescence Quantum Yield in Band Gap Tunable ...
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High Photoluminescence Quantum Yield in Band Gap Tunable Bromide Containing Mixed Halide Perovskites Carolin M. Sutter-Fella†‡, Yanbo Li§ǁ, Matin Amani†‡, Joel W. Ager III‡#, Francesca M. Toma§ǁ, Eli Yablonovitch†‡, Ian D. Sharp§ǁ*, and Ali Javey†‡* †
Electrical Engineering and Computer Sciences, University of California, Berkeley, California
94720, United States ‡
Materials Sciences Division, §Joint Center for Artificial Photosynthesis, and ǁChemical Sciences
Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States ⊥
Materials Science and Engineering, University of California, Berkeley, California 94720,
United States Methods Synthesis of CH3NH3I: A 250 mL round bottom flask was charged with 24 mL of a 33% solution of methylamine (Sigma-Aldrich) in absolute ethanol, 10 mL of a 57% solution of hydrogen iodide (Sigma-Aldrich) in water, and 100 mL of ethanol under nitrogen atmosphere, and left stirring for 2 h at room temperature. The solvent was then removed under reduced
pressure at 50 °C, and a white precipitate formed. The product was collected, thoroughly dried, and finally recrystallized from ethanol (Sigma-Aldrich ≥99.5%). The solid was then dried again at 60 °C for 24 h to yield CH3NH3I. Synthesis of CH3NH3Br: A 250 mL round bottom flask was charged with 28 mL of a 33% solution of methylamine (Sigma-Aldrich) in absolute ethanol, 10 mL of a 48% solution of hydrogen bromide (Sigma-Aldrich) in water, and 100 mL of ethanol under nitrogen atmosphere, and left stirring for 2 h at room temperature. The solvent was then removed under reduced pressure at 50 °C, and a white precipitate formed. The product was collected, thoroughly dried, and finally recrystallized from ethanol (Sigma-Aldrich ≥99.5%). The solid was then dried again at 60 °C for 24 h to yield CH3NH3Br. Perovskite synthesis. Perovskite films with increasing Br concentration were fabricated over the full spectrum (1.6 – 2.3 eV) by a modified two-step low pressure vapor-assisted solution process (LP-VASP). For the synthesis of mixed CH3NH3PbI3-xBrx (0 < x
High Photoluminescence Quantum Yield in Band Gap Tunable Bromide Containing Mixed Halide Perovskites Carolin M. Sutter-Fella†‡, Yanbo Li§ǁ, Matin Amani†‡, Joel W. Ager III‡#, Francesca M. Toma§ǁ, Eli Yablonovitch†‡, Ian D. Sharp§ǁ*, and Ali Javey†‡* †
Electrical Engineering and Computer Sciences, University of California, Berkeley, California
94720, United States ‡
Materials Sciences Division, §Joint Center for Artificial Photosynthesis, and ǁChemical Sciences
Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States ⊥
Materials Science and Engineering, University of California, Berkeley, California 94720,
United States Methods Synthesis of CH3NH3I: A 250 mL round bottom flask was charged with 24 mL of a 33% solution of methylamine (Sigma-Aldrich) in absolute ethanol, 10 mL of a 57% solution of hydrogen iodide (Sigma-Aldrich) in water, and 100 mL of ethanol under nitrogen atmosphere, and left stirring for 2 h at room temperature. The solvent was then removed under reduced
pressure at 50 °C, and a white precipitate formed. The product was collected, thoroughly dried, and finally recrystallized from ethanol (Sigma-Aldrich ≥99.5%). The solid was then dried again at 60 °C for 24 h to yield CH3NH3I. Synthesis of CH3NH3Br: A 250 mL round bottom flask was charged with 28 mL of a 33% solution of methylamine (Sigma-Aldrich) in absolute ethanol, 10 mL of a 48% solution of hydrogen bromide (Sigma-Aldrich) in water, and 100 mL of ethanol under nitrogen atmosphere, and left stirring for 2 h at room temperature. The solvent was then removed under reduced pressure at 50 °C, and a white precipitate formed. The product was collected, thoroughly dried, and finally recrystallized from ethanol (Sigma-Aldrich ≥99.5%). The solid was then dried again at 60 °C for 24 h to yield CH3NH3Br. Perovskite synthesis. Perovskite films with increasing Br concentration were fabricated over the full spectrum (1.6 – 2.3 eV) by a modified two-step low pressure vapor-assisted solution process (LP-VASP). For the synthesis of mixed CH3NH3PbI3-xBrx (0 < x
