Trapped charge-driven degradation of perovskite solar cells

Namyoung Ahn, Kwisung Kwak, Min Seok Jang, Heetae Yoon, Byung Yang Lee, Jong Kwon Lee, Peter V. Pikhitsa, Junseop Byun, Mansoo Choi

Research output: Contribution to journalArticlepeer-review

400 Citations (Scopus)


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.

Original languageEnglish
Article number13422
JournalNature communications
Publication statusPublished - 2016 Nov 10

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)


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