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Title: Defect states in perovskite solar cells associated with hysteresis and performance

External quantum efficiency and transient photocapacitance (TPC) spectra were obtained for perovskite solar cells with methylammonium lead triiodide perovskite absorbers formed by either dip or vapor conversion. These measurements reveal an extended band of sub-gap states in all of the devices studied. The defect band is best fit by a pair of defects, and the appearance of the defect signal in the transient photocapacitance spectra indicates that at least one of the observed defects is in the perovskite absorber. The cells with the largest density of defect states show the lowest shortcircuit current density and open-circuit voltage for slow, quasi-steady-state, current density-voltage sweeps and the largest hysteresis in short-circuit current density for fast sweeps. In conclusion, this suggests that defect states in the perovskite absorber limit steady-state device performance, and that these defects or associated mobile charges play a role in the hysteresis observed in current density-voltage measurements.
Authors:
ORCiD logo [1] ;  [2] ;  [1] ;  [1] ;  [2] ; ORCiD logo [3]
  1. Univ. of Oregon, Eugene, OR (United States). Dept. of Physics
  2. Univ. of Oxford (United Kingdom). Dept. of Physics
  3. Univ. of Oregon, Eugene, OR (United States). Dept. of Chemistry and Biochemistry
Publication Date:
Grant/Contract Number:
SC0012363
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 15; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Oregon, Eugene, OR (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 14 SOLAR ENERGY
OSTI Identifier:
1465763
Alternate Identifier(s):
OSTI ID: 1328813

Miller, D. Westley, Eperon, Giles E., Roe, Ellis T., Warren, Charles W., Snaith, Henry J., and Lonergan, Mark C.. Defect states in perovskite solar cells associated with hysteresis and performance. United States: N. p., Web. doi:10.1063/1.4963760.
Miller, D. Westley, Eperon, Giles E., Roe, Ellis T., Warren, Charles W., Snaith, Henry J., & Lonergan, Mark C.. Defect states in perovskite solar cells associated with hysteresis and performance. United States. doi:10.1063/1.4963760.
Miller, D. Westley, Eperon, Giles E., Roe, Ellis T., Warren, Charles W., Snaith, Henry J., and Lonergan, Mark C.. 2016. "Defect states in perovskite solar cells associated with hysteresis and performance". United States. doi:10.1063/1.4963760. https://www.osti.gov/servlets/purl/1465763.
@article{osti_1465763,
title = {Defect states in perovskite solar cells associated with hysteresis and performance},
author = {Miller, D. Westley and Eperon, Giles E. and Roe, Ellis T. and Warren, Charles W. and Snaith, Henry J. and Lonergan, Mark C.},
abstractNote = {External quantum efficiency and transient photocapacitance (TPC) spectra were obtained for perovskite solar cells with methylammonium lead triiodide perovskite absorbers formed by either dip or vapor conversion. These measurements reveal an extended band of sub-gap states in all of the devices studied. The defect band is best fit by a pair of defects, and the appearance of the defect signal in the transient photocapacitance spectra indicates that at least one of the observed defects is in the perovskite absorber. The cells with the largest density of defect states show the lowest shortcircuit current density and open-circuit voltage for slow, quasi-steady-state, current density-voltage sweeps and the largest hysteresis in short-circuit current density for fast sweeps. In conclusion, this suggests that defect states in the perovskite absorber limit steady-state device performance, and that these defects or associated mobile charges play a role in the hysteresis observed in current density-voltage measurements.},
doi = {10.1063/1.4963760},
journal = {Applied Physics Letters},
number = 15,
volume = 109,
place = {United States},
year = {2016},
month = {10}
}

Works referenced in this record:

Dependence of carrier lifetime on Cu-contacting temperature and ZnTe:Cu thickness in CdS/CdTe thin film solar cells
journal, February 2009

Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells
journal, May 2009
  • Kojima, Akihiro; Teshima, Kenjiro; Shirai, Yasuo
  • Journal of the American Chemical Society, Vol. 131, Issue 17, p. 6050-6051
  • DOI: 10.1021/ja809598r