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Single-crystalline TiO2 nanoparticles for stable and efficient perovskite modules
Yong Ding1,2, Bin Ding1, Hiroyuki Kanda1
1Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL VALAIS, Sion, Switzerland.
Nature Nanotechnology
|April 22, 2022
Summary
Researchers developed a new method for creating single-crystalline titanium dioxide nanoparticles for perovskite solar cells. This innovation boosts efficiency and stability in both small devices and large-area modules, enhancing commercial viability.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Perovskite solar cells (PSCs) show great potential but face challenges in large-area module fabrication and commercial competitiveness.
- Scaling up PSCs requires overcoming obstacles like resistive losses, intrinsic defects in electron transport layers, and achieving high-quality large-area films.
Purpose of the Study:
- To develop a facile method for synthesizing single-crystalline titanium dioxide (TiO2) nanoparticles with specific facets for improved PSC performance.
- To address the challenges of scaling PSCs from small devices to large-area modules while maintaining high efficiency and stability.
Main Methods:
- A facile solvothermal method was employed to synthesize single-crystalline TiO2 rhombohedral nanoparticles with exposed (001) facets.
- These nanoparticles were integrated into perovskite solar cells and large-area modules to evaluate their performance and stability.
Main Results:
- Small-size PSC devices utilizing the synthesized TiO2 nanoparticles achieved a power conversion efficiency of 24.05% and a fill factor of 84.7%.
- The devices demonstrated excellent stability, retaining approximately 90% of their initial performance after 1,400 hours of continuous operation.
- Large-area modules (nearly 24 cm^2) achieved a certified efficiency of 22.72%, showcasing the lowest efficiency loss during scale-up.
Conclusions:
- Single-crystalline TiO2 nanoparticles with exposed (001) facets offer significant advantages for PSCs due to low lattice mismatch, high affinity, high electron mobility, and reduced defects.
- The developed method enables the fabrication of highly efficient and stable perovskite solar modules, paving the way for commercial competitiveness in the thin-film solar cell market.
