Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 7, Pages 6302-6309Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c00515
Keywords
organic-inorganic perovskites; phase transformations; in situ TEM; grain boundaries; twin domains; density functional theory; solid-state nudged elastic band
Funding
- NPRP grant from the Qatar National Research Fund (Qatar Foundation) [8-086-1-017]
- Computational Materials and Processes (CMP) Center at QEERI [P19005]
- Austrian Science Fund (FWF) [P19005] Funding Source: Austrian Science Fund (FWF)
Ask authors/readers for more resources
The severe instability and rapid degradation of hybrid organic-inorganic metal-halide perovskite materials under adverse environmental conditions are one of the major obstacles facing perovskite solar cell (PSC) technology in the path toward large-scale utilization. In this work, the first investigation of the degradation dynamics of the state-of-the-art, triple-cation double-halide perovskite material Cs(0.05)MA(0.10)FA(0.85)Pb(I0.85Br0.15)(3) aided by in situ transmission electron microscope (TEM) imaging is reported. The real-time progression of the degradation is visualized directly inside a TEM at the micron and atomic scales. The degradation originates predominantly at perovskite-substrate heterointerfaces or at grain boundaries, and it propagates through the surrounding grain boundaries and into grain cores through twin domains The degradation dynamics involves a phase transition from the black perovskite alpha-phase to the yellow nonperovskite delta-phase and formation of PbI2 nanoparticles, which later transform into metallic Pb particles. The energy barrier landscape and phase transition pathway are obtained using density functional theory calculations. The results indicate that phase transformations occurring during the degradation follow the reverse sequence of those that occur during perovskite crystallization.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available