Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 39, Pages 21368-21376Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202106394
Keywords
band gap; perovskites; photoluminescence; quantum confinement; solar cells
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Funding
- Swiss National Science Foundation [200020_169695]
- CINECA award under the ISCRA initiative
- MIUR [PON04a2_00490 M2M]
- PRACE [2018184423, 2016153664, 2018184466]
- Swiss National Science Foundation (SNF) [200020_169695] Funding Source: Swiss National Science Foundation (SNF)
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The crystal size in metal halide perovskite films has a significant impact on their opto-electronic characteristics, particularly due to the concurrent effects of quantum confinement and size-dependent structural effects resulting in a wider band gap. This phenomenon assists in photo-induced charge separation and is widely applicable in different compositions and deposition methods.
A comprehensive picture explaining the effect of the crystal size in metal halide perovskite films on their opto-electronic characteristics is currently lacking. We report that perovskite nanocrystallites exhibit a wider band gap due to concurrent quantum confinement and size dependent structural effects, with the latter being remarkably distinct and attributed to the perturbation from the surface of the nanocrystallites affecting the structure of their core. This phenomenon might assist in the photo-induced charge separation within the perovskite in devices employing mesoporous layers as they restrict the size of nanocrystallites present in them. We demonstrate that the crystal size effect is widely applicable as it is ubiquitous in different compositions and deposition methods employed in the fabrication of state-of-the-art perovskite solar cells. This effect is a convenient and effective way to tune the band gap of perovskites.
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