Hafnium oxide interface stabilization for efficient, photothermally stable perovskite solar cells
Yuanhang Yang1,2, Siyang Cheng1,2, Xiaotian Yang1
1School of Physics and Technology, Wuhan University, Wuhan, China.
Science (New York, N.Y.)
|February 26, 2026
Summary
Hafnium oxide interlayers significantly enhance the stability of organic molecular layers in perovskite solar cells. This breakthrough improves device longevity and efficiency under operational stress.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Organic molecular layers are crucial for high-efficiency perovskite solar cells.
- Limited photothermal stability of these layers restricts long-term device performance.
Purpose of the Study:
- To enhance the photothermal stability of organic molecular layers in perovskite solar cells.
- To improve long-term device operation and efficiency.
Main Methods:
- Atomic layer deposition (ALD) of hafnium oxide (HfOx) interlayers.
- Investigated n-HfOx at the NiOx/self-assembled monolayer (SAM) interface.
- Investigated p-HfOx at the perovskite/C60 interface.
Main Results:
- n-HfOx promoted phosphonic acid coordination, enhancing SAM retention and thermal durability.
- p-HfOx anchored 3-fluorophenylethylammonium iodide (3F-PEAI) and acted as a diffusion barrier.
- Achieved 27.1% power conversion efficiency (26.6% certified).
Conclusions:
- HfOx interlayers effectively stabilize organic interfaces in perovskite solar cells.
- Devices maintained over 90% efficiency for ~5000 hours under operational stress.
- Demonstrated a viable strategy for durable, high-performance perovskite solar cells.
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