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The remarkable performance of hybrid perovskite photovoltaics is attributed to their long carrier lifetimes and high photoluminescence (PL) efficiencies. High-quality films are associated with slower PL decays, and it has been claimed that grain boundaries have a negligible impact on performance. We used confocal fluorescence microscopy correlated with scanning electron microscopy to spatially resolve the PL decay dynamics from films of nonstoichiometric organic-inorganic perovskites, CH3NH3PbI3(Cl). The PL intensities and lifetimes varied between different grains in the same film, even for films that exhibited long bulk lifetimes.The grain boundaries were dimmer and exhibited faster nonradiative decay. Energy-dispersive x-ray spectroscopy showed a positive correlation between chlorine concentration and regions of brighter PL, whereas PL imaging revealed that chemical treatment with pyridine could activate previously dark grains.
Science DOI: 10.1126 /science .aaa5333
| Cas | 项目号 | 中文名称 | 规格 |
| 74-89-5 | M822533 | 甲胺醇溶液 | AR,30-33 wt. % in methanol |
| 10034-85-2 | H810917 | 氢碘酸 | 55.0-58.0 % |
| 10035-10-6 | H811364 | 氢溴酸 | 40% |
| 593-51-1 | M824348 | 甲胺盐酸盐 | 99.5% |
| 6876-37-5 | M824349 | 甲基溴化胺 | 99.5% |
| 14965-49-2 | M824044 | 甲基碘化胺 | 99.5% |
| 6313-33-3 | F824350 | 甲脒盐酸盐 | 99.5% |
| 146958-06-7 | F824363 | 甲脒氢溴酸盐 | 99.5% |
| 879643-71-7 | F824046 | 甲脒氢碘酸盐 | 99.5% |
| 68007-08-9 | I824364 | 咪唑氢碘酸盐 | 99% |
| 90076-65-6 | B822763 | 双三氟甲烷磺酰亚胺锂 | 99.9% |
| 207739-72-8 | T822802 | 2,2',7,7'-四[N,N-二(4-甲氧基苯基)氨基]-9,9'-螺二芴(Spiro-MeOTAD) | 99% |
| 75-05-8 | A801456 | 无水乙腈 | 99.9%,Water≤30 ppm (by K.F.), MkSeal |
| 108-90-7 | C805820 | 氯苯 | 99%,Water≤50 ppm (by K.F.), MkSeal |
| 68-12-2 | N807978 | N,N-二甲基甲酰胺(DMF) | 99.8%,Water≤50 ppm (by K.F.),MkSeal |
