Defect states in perovskite solar cells associated with hysteresis and performance

Miller, D. Westley; Eperon, Giles E.; Roe, Ellis T.; Warren, Charles W.; Snaith, Henry J.; Lonergan, Mark C.

doi:10.1063/1.4963760

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

Journal Article · Mon Oct 10 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4963760· OSTI ID:1465763

^[1]; Eperon, Giles E. ^[2]; Roe, Ellis T. ^[1]; Warren, Charles W. ^[1]; Snaith, Henry J. ^[2];

^[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

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.

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Research Organization:: Univ. of Oregon, Eugene, OR (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012363

OSTI ID:: 1465763

Alternate ID(s):: OSTI ID: 1328813

Journal Information:: Applied Physics Letters, Vol. 109, Issue 15; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 59 works

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