Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 19, Pages 5232-5236Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201700600
Keywords
freeze-drying casting; Mie scattering; perovskites; porous films; recrystallization
Categories
Funding
- National Basic Research Program of China [2014CB931702]
- National Key Research and Development Program of China [2016YFB0401701]
- NSFC [51572128, 61604074, 51672132, 11604152]
- NSFC-RGC [5151101197]
- Natural Science Foundation of Jiangsu Province [BK20160827, BK20160815]
- China Postdoctoral Science Foundation [2016M590455]
- Fundamental Research Funds for the Central Universities [30915012205, 30916015106]
- PAPD of Jiangsu Higher Education Institutions
- Opened Fund of the State Key Laboratory on Integrated Optoelectronics [2015IOSKLKF15]
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Light harvesting (LH) and carrier transport abilities of a photoactive layer, which are both crucial for optoelectronic devices such as solar cells and photodetectors (PDs), are typically hard to be synergistically improved. Taking perovskite as an example, a freeze-drying recrystallization method is used to construct porous films with improvements of both LH and carrier transport ability. During the freeze-drying casting process, the rapid solvent evaporation produces massive pores, the sizes of which can be adjusted to exploit the Mie scattering for enhancement of the LH ability. Meanwhile, owing to the strong iconicity, the interface between perovskite nanocrystals fused during recrystallization, which favors carrier transport. Subsequently, PDs based on these Mie porous and interface-fused films show a high on/off ratio of more than 10(4) and an external quantum efficiency value of 658% under 9V bias and 520nm light irradiation.
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