TY - JOUR
T1 - Visualization of Ion Migration in an Inorganic Mixed Halide Perovskite by One-Photon and Multiphoton Absorption
T2 - Effect of Guanidinium A-Site Cation Incorporation
AU - Kung, Po Kai
AU - Lin, Kuang I.
AU - Wu, Chun Sheng
AU - Li, Ming Hsien
AU - Chan, Chia Ru
AU - Rajendran, Raja
AU - Lin, Chen Fu
AU - Chen, Peter
N1 - Funding Information:
The financial support from the Ministry of Science and Technology (MOST 107-2221-E-006-190-MY3, MOST 108-2218-E-006-043-MY3, MOST 110-2221-E-006-200, MOST 111-2221-E-006-061-MY2, and MOST 111-2113-M-006-009) is acknowledged. The authors are thankful for the financial support from the Hierarchical Green-Energy Materials (Hi-GEM) Research Center and from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) and the Ministry of Science and Technology (MOST 110-2634-F-006-017 and MOST 109-2124-M-006-001) in Taiwan. The authors gratefully acknowledge the use of code XRD005101 of the machine equipment belonging to the Core Facility Center of National Cheng Kung University. This research was supported in part by the Higher Education Sprout Project, Ministry of Education, to the Headquarters of University Advancement at National Cheng Kung University (NCKU).
Publisher Copyright:
© 2022 American Chemical Society.
PY - 2022/8/4
Y1 - 2022/8/4
N2 - In this work, we present the ion migration of CsPbIBr2 under illumination and impede it by incorporating the large cations of guanidinium (GA). A series of "probe-set-probe"operations are applied to assess the photoluminescence (PL) behavior spectrally and spatially, which is correlated to the ion migration-induced phase separation, of CsPbIBr2 and GAxCs1-xPbIBr2 perovskites. The local lattice distortion introduced by GA could reduce the strain gradient in GAxCs1-xPbIBr2 to inhibit the ion migration, leading to a stable PL spectrum and enhanced device stability under light stimulation. A solar cell with an optimized stoichiometric composition of GA0.1Cs0.9PbIBr2 delivers comparable photovoltaic performance and improved stability compared to those of CsPbIBr2-based perovskite solar cells, retaining 80% of its initial power conversion efficiency after being continuously bathed in light for 8 h under ambient conditions without encapsulation, while the CsPbIBr2 counterpart shows an efficiency that is <30% of its initial value under the same test condition.
AB - In this work, we present the ion migration of CsPbIBr2 under illumination and impede it by incorporating the large cations of guanidinium (GA). A series of "probe-set-probe"operations are applied to assess the photoluminescence (PL) behavior spectrally and spatially, which is correlated to the ion migration-induced phase separation, of CsPbIBr2 and GAxCs1-xPbIBr2 perovskites. The local lattice distortion introduced by GA could reduce the strain gradient in GAxCs1-xPbIBr2 to inhibit the ion migration, leading to a stable PL spectrum and enhanced device stability under light stimulation. A solar cell with an optimized stoichiometric composition of GA0.1Cs0.9PbIBr2 delivers comparable photovoltaic performance and improved stability compared to those of CsPbIBr2-based perovskite solar cells, retaining 80% of its initial power conversion efficiency after being continuously bathed in light for 8 h under ambient conditions without encapsulation, while the CsPbIBr2 counterpart shows an efficiency that is <30% of its initial value under the same test condition.
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U2 - 10.1021/acs.jpclett.2c01515
DO - 10.1021/acs.jpclett.2c01515
M3 - Article
C2 - 35876494
AN - SCOPUS:85135597762
SN - 1948-7185
VL - 13
SP - 6944
EP - 6955
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 30
ER -