See all entries for this property (3 total)
Starting materials: HI, SnI2, phenylethylammonium iodide (PEAI), toluene
Product: Thin film on quartz substrate
Description: Crystals were grown by slowly cooling a solution of HI and PEAI and SnI2. SnI2 was added first, then the organic salt, and then HI. The solution was mixed and heated to 94 degrees Celsius to completely dissolve SnI2. The solution was then cooled at 3 degrees per hour until 0 degrees was reached, resulting in the formation of red crystals. The crystals were filtered in an inert atmosphere and also rectrystallized twice from a solution of methanol and toluene. To produce films of the unintercalated systems, the recrystallized perovskites were dissolved in distilled methanol. Previously cleaned and prepared quartz substrates were used and the solution was spin coated onto them. The spinning cycle was 1 s ramp up to 1800 rpm, and then 30 s at 1800 rpm. Then the samples were annealed at 70 degrees Celsius for 15 minutes to remove any residual solvent.
Method: UV-vis absorption
Description: Absorption spectra were measured with a Hewlett-Packard UV-vis 8543 spectrophotometer at room temperature on the quartz thin-film samples.
Crystal system: monoclinic
| Absorption peak position, nm |
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Starting materials: HI, SnI2, phenylethylammonium iodide (PEAI), toluene
Product: Thin film on quartz substrate
Description: Crystals were grown by slowly cooling a solution of HI and PEAI and SnI2. SnI2 was added first, then the organic salt, and then HI. The solution was mixed and heated to 94 degrees Celsius to completely dissolve SnI2. The solution was then cooled at 3 degrees per hour until 0 degrees was reached, resulting in the formation of red crystals. The crystals were filtered in an inert atmosphere and also rectrystallized twice from a solution of methanol and toluene. To produce films of the unintercalated systems, the recrystallized perovskites were dissolved in distilled methanol. Previously cleaned and prepared quartz substrates were used and the solution was spin coated onto them. The spinning cycle was 1 s ramp up to 1800 rpm, and then 30 s at 1800 rpm. Then the samples were annealed at 70 degrees Celsius for 15 minutes to remove any residual solvent.
Method: UV-vis absorption
Description: Absorption spectra were measured with a Hewlett-Packard UV-vis 8543 spectrophotometer at room temperature on the quartz thin-film samples.
Comment: Exciton peak is noted here. (2.04 eV)