Metal Halide Solid-State Surface Treatment for High Efficiency PbS and PbSe QD Solar Cells

Crisp, R. W.; Kroupa, D. M.; Marshall, A. R.; Miller, E. M.; Zhang, J.; Beard, M. C.; Luther, J. M.

doi:10.1038/srep09945

Title: Metal Halide Solid-State Surface Treatment for High Efficiency PbS and PbSe QD Solar Cells

Journal Article · Fri Apr 24 00:00:00 EDT 2015 · Scientific Reports

DOI:https://doi.org/10.1038/srep09945· OSTI ID:1220641

Crisp, R. W. ^[1]; Kroupa, D. M. ^[2]; Marshall, A. R. ^[2]; Miller, E. M. ^[3]; Zhang, J. ^[4]; Beard, M. C. ^[3]; Luther, J. M. ^[3]

National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Huazhong Univ. of Science and Technology, Hubei (China)

We developed a layer-by-layer method of preparing PbE (E = S or Se) quantum dot (QD) solar cells using metal halide (PbI₂, PbCl₂, CdI₂, or CdCl₂) salts dissolved in dimethylformamide to displace oleate surface ligands and form conductive QD solids. The resulting QD solids have a significant reduction in the carbon content compared to films treated with thiols and organic halides. We find that the PbI₂ treatment is the most successful in removing alkyl surface ligands and also replaces most surface bound Cl- with I-. The treatment protocol results in PbS QD films exhibiting a deeper work function and band positions than other ligand exchanges reported previously. The method developed here produces solar cells that perform well even at film thicknesses approaching a micron, indicating improved carrier transport in the QD films. We demonstrate QD solar cells based on PbI₂ with power conversion efficiencies above 7%.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Advanced Solar Photophysics (CASP)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1220641

Report Number(s):: NREL/JA-5900-63170

Journal Information:: Scientific Reports, Vol. 5; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 184 works

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