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Multifunctional Crosslinking-Enabled Strain-Regulating Crystallization for Stable, Efficient α-FAPbI3 -Based
Hengkai Zhang1,2, Zhiliang Chen1, Minchao Qin3
1Department of Electronic and Information Engineering, Research Institute for Smart Energy (RISE), The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Advanced Materials (Deerfield Beach, Fla.)
|June 4, 2021
Summary
Researchers developed a new method to stabilize perovskite solar cells (PSCs). This technique reduces strain, enhances efficiency to 22.39%, and improves long-term stability for next-generation solar energy.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Alpha-formamidinium lead triiodide (α-FAPbI3) is a leading material for perovskite solar cells (PSCs).
- α-FAPbI3 suffers from thermal instability due to tensile strain, limiting device performance and longevity.
Purpose of the Study:
- To introduce an in situ crosslinking-enabled strain-regulating crystallization (CSRC) method for stabilizing α-FAPbI3 perovskite films.
- To enhance the power conversion efficiency (PCE) and operational stability of PSCs.
Main Methods:
- Developed a CSRC method using trimethylolpropane triacrylate (TMTA) to control strain during perovskite crystallization.
- Applied TMTA crosslinking in situ to confine thermal expansion and regulate strain in the perovskite film.
- Investigated the effects of CSRC on perovskite film morphology, defects, and device performance.
Main Results:
- The CSRC method effectively regulated tensile strain, converting it to compressive strain in the perovskite film.
- Achieved simultaneous defect passivation, enlarged grain size, and an enhanced open-circuit voltage (VOC) of 50 mV.
- PSC devices fabricated with CSRC demonstrated a significantly improved PCE of 22.39% compared to 20.29% in control devices.
- CSRC-treated devices exhibited outstanding stability, retaining 95% of initial PCE after 4000 hours of storage and 80% after 1248 hours of light soaking.
Conclusions:
- The CSRC method with TMTA is a highly effective strategy for stabilizing α-FAPbI3 perovskite films.
- This approach overcomes the critical instability factor of tensile strain, leading to superior PCE and remarkable device durability.
- The findings pave the way for more robust and efficient perovskite solar cells.
