Journal
CHEM
Volume 7, Issue 11, Pages 3131-3143Publisher
CELL PRESS
DOI: 10.1016/j.chempr.2021.08.009
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Funding
- National Natural Science Foundation of China [21771114, 91956130]
- Distinguished Young Scholars of Tianjin [19JCJQJC62000]
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The introduction of halogen-halogen bonds at the phase interface successfully suppresses ion migration in mixed-halide perovskite, leading to a stable and efficient photovoltaic device. Encapsulated devices exhibit long-term stability and high performance, offering a new solution to the stability challenges of perovskite materials.
Mixed-halide perovskite provides band-gap tunability, which is essential for tandem solar cell application. However, ion migration inducing phase segregation seriously affects the device's long-term operational stability. The issue thus represents an important challenge for the whole perovskite community and urgently needs effective solutions. We showcase here for the first time that a strong chemical interaction, a halogen-halogen bond, is introduced at the phase interface to suppress the ion migration by increasing the corresponding activation energy Various characterizations have proved that halogen-halogen bonds form between 2D and 3D phases, which do suppress the halide segregation. As expected, the encapsulated device retains 90% of initial power conversion efficiency (PCE) after maximum power point (MPP) tracking for similar to 500 h under continuous simulated 1-sun illumination (AM 1.5) in ambient conditions, representing one of the most stable, wideband-gap, mixed-halide perovskite photovoltaics reported so far.
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