Defect states in perovskite solar cells associated with hysteresis and performance
Abstract
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:
-
[1];
[3]
- Univ. of Oregon, Eugene, OR (United States). Dept. of Physics
- Univ. of Oxford (United Kingdom). Dept. of Physics
- Univ. of Oregon, Eugene, OR (United States). Dept. of Chemistry and Biochemistry
- Publication Date:
- Research Org.:
- Univ. of Oregon, Eugene, OR (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1465763
- Alternate Identifier(s):
- OSTI ID: 1328813
- Grant/Contract Number:
- SC0012363
- Resource 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)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; 14 SOLAR ENERGY
Citation Formats
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., 2016.
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. https://doi.org/10.1063/1.4963760
Miller, D. Westley, Eperon, Giles E., Roe, Ellis T., Warren, Charles W., Snaith, Henry J., and Lonergan, Mark C. Mon .
"Defect states in perovskite solar cells associated with hysteresis and performance". United States. https://doi.org/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 = {Mon Oct 10 00:00:00 EDT 2016},
month = {Mon Oct 10 00:00:00 EDT 2016}
}
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