Trapped charge-driven degradation of perovskite solar cells.
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.
Global Frontier Center for Multiscale Energy Systems, Seoul National University, Seoul 08826, Korea.|Department of Mechanical and Aerospace Engineering, Seoul National University, Shinlimdong, Seoul 08826, Korea.
Namyoung
N
Ahn
Global Frontier Center for Multiscale Energy Systems, Seoul National University, Seoul 08826, Korea.|Department of Mechanical and Aerospace Engineering, Seoul National University, Shinlimdong, Seoul 08826, Korea.
Kwisung
K
Kwak
School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea.
Min Seok
MS
Jang
Global Frontier Center for Multiscale Energy Systems, Seoul National University, Seoul 08826, Korea.|Department of Mechanical and Aerospace Engineering, Seoul National University, Shinlimdong, Seoul 08826, Korea.
Heetae
H
Yoon
Department of Mechanical Engineering, Korea University, Seoul 02841, Korea.
Byung Yang
BY
Lee
Global Frontier Center for Multiscale Energy Systems, Seoul National University, Seoul 08826, Korea.
Jong-Kwon
JK
Lee
Global Frontier Center for Multiscale Energy Systems, Seoul National University, Seoul 08826, Korea.
Peter V
PV
Pikhitsa
Global Frontier Center for Multiscale Energy Systems, Seoul National University, Seoul 08826, Korea.|Department of Mechanical and Aerospace Engineering, Seoul National University, Shinlimdong, Seoul 08826, Korea.
Junseop
J
Byun
Global Frontier Center for Multiscale Energy Systems, Seoul National University, Seoul 08826, Korea.|Department of Mechanical and Aerospace Engineering, Seoul National University, Shinlimdong, Seoul 08826, Korea.
Mansoo
M
Choi