Trapped charge-driven degradation of perovskite solar cells

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Perovskite solar cells have shown unprecedent performance increase up to 22% efficiency. However, their photovoltaic performance has shown fast deterioration under light illumination in the presence of humid air even with encapulation. The stability of perovskite materials has been unsolved and its mechanism has been elusive. Here we uncover a mechanism for irreversible degradation of perovskite materials in which trapped charges, regardless of the polarity, play a decisive role. An experimental setup using different polarity ions revealed that the moisture-induced irreversible dissociation of perovskite materials is triggered by charges trapped along grain boundaries. We also identified the synergetic effect of oxygen on the process of moisture-induced degradation. The deprotonation of organic cations by trapped charge-induced local electric field would be attributed to the initiation of irreversible decomposition.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2016-11
Language
English
Article Type
Article
Keywords

ORGANOMETAL HALIDE PEROVSKITES; CH3NH3PBI3 PEROVSKITE; HIGH-PERFORMANCE; V HYSTERESIS; EFFICIENCY; STATE; STABILITY; LAYER; EXPOSURE; IODIDE

Citation

NATURE COMMUNICATIONS, v.7

ISSN
2041-1723
DOI
10.1038/ncomms13422
URI
http://hdl.handle.net/10203/214043
Appears in Collection
EE-Journal Papers(저널논문)
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