Journal
ADVANCED MATERIALS
Volume 30, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201705017
Keywords
comminution; high pressure; nanoslices; perovskite nanocrystals; recrystallization
Categories
Funding
- National Natural Science Foundation of China [11704185]
- Natural Science Foundation of Jiangsu Province, China [BK20171021]
- Ministry of Education (MOE) [RG103/16, MOE2015-T2-1-148, MOE2011-T3-1-005]
- Ministry of Education Academic Research Fund Tier 1 Grant [RG173/16]
- Ministry of Education Academic Research Fund Tier 2 Grant [MOE2015-T2-2-015, MOE2016-T2-1-034]
- Singapore National Research Foundation through the Singapore-Berkeley Research Initiative for Sustainable Energy (SinBeRISE) CREATE Program
- Competitive Research Program [NRF-CRP14-2014-03]
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High pressure (HP) can drive the direct sintering of nanoparticle assemblies for Ag/Au, CdSe/PbS nanocrystals (NCs). Instead of direct sintering for the conventional nanocrystals, this study experimentally observes for the first time high-pressure-induced comminution and recrystallization of organicinorganic hybrid perovskite nanocrystals into highly luminescent nanoplates with a shorter carrier lifetime. Such novel pressure response is attributed to the unique structural nature of hybrid perovskites under high pressure: during the drastic cubic-orthorhombic structural transformation at approximate to 2 GPa, (301) the crystal plane fully occupied by organic molecules possesses a higher surface energy, triggering the comminution of nanocrystals into nanoslices along such crystal plane. Beyond bulk perovskites, in which pressure-induced modifications on crystal structures and functional properties will disappear after pressure release, the pressure-formed variants, i.e., large (approximate to 100 nm) and thin (<10 nm) perovskite nanoplates, are retained and these exhibit simultaneous photoluminescence emission enhancing (a 15-fold enhancement in the photoluminescence) and carrier lifetime shortening (from approximate to 18.3 +/- 0.8 to approximate to 7.6 +/- 0.5 ns) after releasing of pressure from 11 GPa. This pressure-induced comminution of hybrid perovskite NCs and a subsequent amorphization-recrystallization treatment offer the possibilities of engineering the advanced hybrid perovskites with specific properties.
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