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Research Update: Comparison of salt- and molecular-based iodine treatments of PbS nanocrystal solids for solar cells
2.J. Tang, K. W. Kemp, S. Hoogland, K. S. Jeong, H. Liu, L. Levina, X. Wang, R. Debnath, D. Cha, K. W. Chou, A. F. Aram, J. B. Asbury, E. H. Sargent, M. Furukawa, A. Fischer, and A. Amassian, Nat. Mater. 10, 765 (2011).
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See supplementary material at http://dx.doi.org/10.1063/1.4907158
for material synthesis and characterization, Figure S1; film characterization, Figure S2; fitting of ellipsometry data; ligand exchange and infrared absorption, Figure S3; and details on the assessment of the change in open-circuit voltage.[Supplementary Material]
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Molecular- and salt-based chemical treatments are believed to passivate electronic trap states in nanocrystal-based semiconductors, which are considered promising for solar cells but suffer from high carrier recombination. Here, we compare the chemical, optical, and electronic properties of PbS nanocrystal-based solids treated with molecular iodine and tetrabutylammonium iodide. Surprisingly, both treatments increase—rather than decrease—the number density of trap states; however, the increase does not directly influence solar cell performance. We explain the origins of the observed impact on solar cell performance and the potential in using different chemical treatments to tune charge carrier dynamics in nanocrystal-solids.
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