Distribution and Charge State of Iron Impurities in Intentionally Contaminated Lead Halide Perovskites
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Poindexter_JPV_DistributionofFeinperovskites_revised_ResearchGate.pdf
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1.16 MB
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Author(s)
Rose, Volker
Lai, Barry
Cai, Zhonghou
Poindexter, Jeremy Roger
Jensen, Mallory Ann
Morishige, Ashley Elizabeth
Looney, Erin Elizabeth
Youssef, Amanda
Correa-Baena, Juan-Pablo
Wieghold, Sarah
Date Issued
January 2018
Journal
IEEE Journal of Photovoltaics
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
Poindexter, Jeremy R., Mallory A. Jensen, Ashley E. Morishige, Erin E. Looney, Amanda Youssef, Juan-Pablo Correa-Baena, Sarah Wieghold, et al. “Distribution and Charge State of Iron Impurities in Intentionally Contaminated Lead Halide Perovskites.” IEEE Journal of Photovoltaics 8, no. 1 (January 2018): 156–161.
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Author's final manuscript
Abstract
Impurity contamination in thin-film solar cells remains an uncertain risk due to the little-known impact of impurities on recombination. Building upon previous work, in which we intentionally contaminated lead halide perovskite (LHP) solar cells with iron, we further examine the distribution and charge state of iron-induced defects in LHP films using synchrotron-based X-ray techniques. X-ray absorption measurements suggest that iron-rich regions, which form among iron feedstock concentrations that exceed 100 ppm, most closely resemble the chemistry of Fe2O3. Iron distributed within the bulk may form a mix of Fe2+and Fe3+, the latter of which is not expected to be recombination active, potentially allowing LHPs to incorporate more iron than traditional semiconductors. X-ray beam induced current measurements show little correlation between the presence of iron-rich regions and charge collection, which further suggests low recombination activity at these sites. These results further elucidate the recombination behavior caused by iron incorporation in LHP films, revealing insight into how inhomogeneous incorporation of impurities may mitigate photovoltaic performance degradation.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1109/JPHOTOV.2017.2775156
