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

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:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5]
  1. Huazhong University of Science and Technology, Hubei (China); National Renewable Energy Laboratory, Golden, CO (United States)
  2. National Renewable Energy Lab. and Colorado School of Mines, Golden, CO (United States)
  3. National Renewable Energy Lab., Golden, CO (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. National Renewable Energy Lab., Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)
  5. National Renewable Energy Lab., Golden, CO (United States)
Publication Date:
Report Number(s):
NREL/JA-5900-64079
Journal ID: ISSN 1948-7185
Grant/Contract Number:
AC52-06NA25396; AC36-08G028308; AC36-08GO28308
Type:
Published Article
Journal Name:
Journal of Physical Chemistry Letters
Additional Journal Information:
Journal Volume: 6; Journal Issue: 10; Journal ID: ISSN 1948-7185
Publisher:
American Chemical Society
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
nanocrystals; ligands; oleic acid; solar cells; photovoltaics; 14 SOLAR ENERGY; 77 NANOSCIENCE AND NANOTECHNOLOGY; photovoltaics (PV)
OSTI Identifier:
1183797
Alternate Identifier(s):
OSTI ID: 1214941; OSTI ID: 1220732