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 and Mansoo Choi ()
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Namyoung Ahn: Global Frontier Center for Multiscale Energy Systems, Seoul National University
Kwisung Kwak: Global Frontier Center for Multiscale Energy Systems, Seoul National University
Min Seok Jang: School of Electrical Engineering, Korea Advanced Institute of Science and Technology
Heetae Yoon: Global Frontier Center for Multiscale Energy Systems, Seoul National University
Byung Yang Lee: Korea University
Jong-Kwon Lee: Global Frontier Center for Multiscale Energy Systems, Seoul National University
Peter V. Pikhitsa: Global Frontier Center for Multiscale Energy Systems, Seoul National University
Junseop Byun: Global Frontier Center for Multiscale Energy Systems, Seoul National University
Mansoo Choi: Global Frontier Center for Multiscale Energy Systems, Seoul National University

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract 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.

Date: 2016
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DOI: 10.1038/ncomms13422

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