Journal
SCIENCE
Volume 348, Issue 6240, Pages 1226-1230Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa2951
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Funding
- Center for Re-Defining Photovoltaic Efficiency Through Molecule Scale Control, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001085]
- Department of Energy [DE-SC0006410]
- Empire State Development's Division of Science, Technology and Innovation
- National Center for Research Resources, NIH [C06 RR017528-01-CEM]
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Office of Basic Energy Sciences [DE-AC02-98CH10886]
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Controlling the size of colloidal nanocrystals is essential to optimizing their performance in optoelectronic devices, catalysis, and imaging applications. Traditional synthetic methods control size by terminating the growth, an approach that limits the reaction yield and causes batch-to-batch variability. Herein we report a library of thioureas whose substitution pattern tunes their conversion reactivity over more than five orders of magnitude and demonstrate that faster thiourea conversion kinetics increases the extent of crystal nucleation. Tunable kinetics thereby allows the nanocrystal concentration to be adjusted and a desired crystal size to be prepared at full conversion. Controlled precursor reactivity and quantitative conversion improve the batch-to-batch consistency of the final nanocrystal size at industrially relevant reaction scales.
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