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Title: Synthetic Conditions for High-Accuracy Size Control of PbS Quantum Dots

Abstract

Decreasing the variability in quantum dot (QD) syntheses is desirable for better uniformity of samples for use in QD-based studies and applications. Here we report a highly reproducible linear relationship between the concentration of ligand (in this case oleic acid, OA) and the lowest energy exciton peak position (nm) of the resulting PbS QDs for various hot-injection temperatures. Thus, for a given injection temperature, the size of the PbS QD product is purely controlled by the amount of OA. We used this relationship to study PbS QD solar cells that are fabricated from the same size of PbS QDs but synthesized using four different injection temperatures: 95, 120, 150, and 185 °C. We find that the power conversion efficiency does not depend on injection temperature but that the Voc is higher for QDs synthesized at lower temperatures while the Jsc is improved in higher temperature QDs.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Advanced Solar Photophysics (CASP)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1370924
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry Letters
Additional Journal Information:
Journal Volume: 6; Journal Issue: 10; Related Information: CASP partners with Los Alamos National Laboratory (lead); University of California, Irvine; University of Colorado; Colorado School of Mines; George Mason University; Los Alamos National Laboratory; University of Minnesota; National Renewable Energy Laboratory; Journal ID: ISSN 1948-7185
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; solar (photovoltaic), solar (fuels), solid state lighting, bio-inspired, electrodes - solar, defects, charge transport, materials and chemistry by design, optics, synthesis (novel materials), synthesis (scalable processing)

Citation Formats

Zhang, Jianbing, Crisp, Ryan W., Gao, Jianbo, Kroupa, Daniel M., Beard, Matthew C., and Luther, Joseph M. Synthetic Conditions for High-Accuracy Size Control of PbS Quantum Dots. United States: N. p., 2015. Web. doi:10.1021/acs.jpclett.5b00689.
Zhang, Jianbing, Crisp, Ryan W., Gao, Jianbo, Kroupa, Daniel M., Beard, Matthew C., & Luther, Joseph M. Synthetic Conditions for High-Accuracy Size Control of PbS Quantum Dots. United States. doi:10.1021/acs.jpclett.5b00689.
Zhang, Jianbing, Crisp, Ryan W., Gao, Jianbo, Kroupa, Daniel M., Beard, Matthew C., and Luther, Joseph M. Thu . "Synthetic Conditions for High-Accuracy Size Control of PbS Quantum Dots". United States. doi:10.1021/acs.jpclett.5b00689.
@article{osti_1370924,
title = {Synthetic Conditions for High-Accuracy Size Control of PbS Quantum Dots},
author = {Zhang, Jianbing and Crisp, Ryan W. and Gao, Jianbo and Kroupa, Daniel M. and Beard, Matthew C. and Luther, Joseph M.},
abstractNote = {Decreasing the variability in quantum dot (QD) syntheses is desirable for better uniformity of samples for use in QD-based studies and applications. Here we report a highly reproducible linear relationship between the concentration of ligand (in this case oleic acid, OA) and the lowest energy exciton peak position (nm) of the resulting PbS QDs for various hot-injection temperatures. Thus, for a given injection temperature, the size of the PbS QD product is purely controlled by the amount of OA. We used this relationship to study PbS QD solar cells that are fabricated from the same size of PbS QDs but synthesized using four different injection temperatures: 95, 120, 150, and 185 °C. We find that the power conversion efficiency does not depend on injection temperature but that the Voc is higher for QDs synthesized at lower temperatures while the Jsc is improved in higher temperature QDs.},
doi = {10.1021/acs.jpclett.5b00689},
journal = {Journal of Physical Chemistry Letters},
issn = {1948-7185},
number = 10,
volume = 6,
place = {United States},
year = {2015},
month = {5}
}