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Title: Distribution and Charge State of Iron Impurities in Intentionally Contaminated Lead Halide Perovskites

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 Fe 2O 3. Iron distributed within the bulk may form a mix of Fe 2+ and Fe 3+, 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. In conclusion, 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.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [4] ;  [4] ;  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); 1366 Technologies Inc., Bedford, MA (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials and Advanced Photon Source
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS), X-ray Science Division
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
IEEE Journal of Photovoltaics
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2156-3381
Publisher:
IEEE
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 14 SOLAR ENERGY; extrinsic defects; impurities; methylammonium lead iodide; photovoltaics (PVs); solar energy; synchrotron; transition metals; x-ray fluorescence
OSTI Identifier:
1468748

Poindexter, Jeremy R., Jensen, Mallory A., Morishige, Ashley E., Looney, Erin E., Youssef, Amanda, Correa-Baena, Juan-Pablo, Wieghold, Sarah, Rose, Volker, Lai, Barry, Cai, Zhonghou, and Buonassisi, Tonio. Distribution and Charge State of Iron Impurities in Intentionally Contaminated Lead Halide Perovskites. United States: N. p., Web. doi:10.1109/JPHOTOV.2017.2775156.
Poindexter, Jeremy R., Jensen, Mallory A., Morishige, Ashley E., Looney, Erin E., Youssef, Amanda, Correa-Baena, Juan-Pablo, Wieghold, Sarah, Rose, Volker, Lai, Barry, Cai, Zhonghou, & Buonassisi, Tonio. Distribution and Charge State of Iron Impurities in Intentionally Contaminated Lead Halide Perovskites. United States. doi:10.1109/JPHOTOV.2017.2775156.
Poindexter, Jeremy R., Jensen, Mallory A., Morishige, Ashley E., Looney, Erin E., Youssef, Amanda, Correa-Baena, Juan-Pablo, Wieghold, Sarah, Rose, Volker, Lai, Barry, Cai, Zhonghou, and Buonassisi, Tonio. 2017. "Distribution and Charge State of Iron Impurities in Intentionally Contaminated Lead Halide Perovskites". United States. doi:10.1109/JPHOTOV.2017.2775156. https://www.osti.gov/servlets/purl/1468748.
@article{osti_1468748,
title = {Distribution and Charge State of Iron Impurities in Intentionally Contaminated Lead Halide Perovskites},
author = {Poindexter, Jeremy R. and Jensen, Mallory A. and Morishige, Ashley E. and Looney, Erin E. and Youssef, Amanda and Correa-Baena, Juan-Pablo and Wieghold, Sarah and Rose, Volker and Lai, Barry and Cai, Zhonghou and Buonassisi, Tonio},
abstractNote = {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. In conclusion, 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.},
doi = {10.1109/JPHOTOV.2017.2775156},
journal = {IEEE Journal of Photovoltaics},
number = 1,
volume = 8,
place = {United States},
year = {2017},
month = {12}
}