Abstract
Halide perovskites have exceptional optoelectronic properties, but a poor understanding of the relationship between crystal dimensions, composition, and properties limits their use in integrated devices. We report a new multiplexed cantilever-free scanning probe method for synthesizing compositionally diverse and size-controlled halide perovskite nanocrystals spanning square centimeter areas. Single-particle photoluminescence studies reveal multiple independent emission modes due to defect-defined band edges with relative intensities that depend on crystal size at a fixed composition. Smaller particles, but ones with dimensions that exceed the quantum confinement regime, exhibit blue-shifted emission due to reabsorption of higher-energy modes. Six different halide perovskites have been synthesized, including a layered Ruddlesden-Popper phase, and the method has been used to prepare functional solar cells based on single nanocrystals. The ability to pattern arrays of multicolor light-emitting nanocrystals opens avenues toward the development of optoelectronic devices, including optical displays.
Original language | English (US) |
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Article number | eabc4959 |
Journal | Science Advances |
Volume | 6 |
Issue number | 39 |
DOIs | |
State | Published - Sep 2020 |
Funding
This material is based on work supported by the Air Force Office of Scientific Research (FA9550-17-1-0348 and FA9550-16-1-0150), the Sherman Fairchild Foundation Inc., and the NSF (DBI-1353682). T.K.S. was supported by the Office of Naval Research (N00014-16- 1-3055). This work made use of facilities at the NUANCE Center, the NUFAB, and SHyNE Resource at NU (NSF ECCS-1542205 and NSF DMR-1720139).
ASJC Scopus subject areas
- General