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Published on: February 27, 2017
Engineering Spacer Conjugation for Efficient and Stable 2D/3D Perovskite Solar Cells and Modules
Jinping Zhang1, Liangli Chu1,2, Tianjun Liu3
1State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory of Intelligent Nano Materials and Devices of Ministry of Education, Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
Introducing aromatic spacers like pyrenylbutanamine (PyBA) into 2D/3D perovskite solar cells (PSCs) significantly enhances charge transport and device stability. This innovation boosts power conversion efficiency and improves resistance to environmental stressors.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Two-dimensional (2D) perovskites improve 3D perovskite solar cell (PSC) stability and efficiency.
- Bulky-cation 2D structures in PSCs suffer from poor charge transport and charge-extraction barriers.
Purpose of the Study:
- To address charge transport and extraction issues in 2D/3D PSCs.
- To enhance the stability and efficiency of PSCs by introducing conjugated aromatic spacers into 2D perovskites.
Main Methods:
- Incorporation of aromatic spacers with molecular conjugation into 2D perovskites between 3D perovskites and electron transport layers.
- Testing various aromatic spacers, with a focus on pyrenylbutanamine (PyBA) for its high degree of conjugation.
Main Results:
- PyBA spacer demonstrated superior charge transport and extraction in 2D/3D PSCs.
- Achieved a power conversion efficiency (PCE) of 25.3% in single cells and 21.0% in modules.
- PyBA incorporation significantly improved resistance to moisture, ion migration, and thermal/operational stress.
Conclusions:
- Conjugated aromatic spacers, particularly PyBA, are effective in overcoming charge transport limitations in 2D/3D PSCs.
- PyBA-based PSCs exhibit exceptional environmental, thermal, and operational stability, retaining over 90% PCE after extensive testing.
- This approach offers a promising pathway for developing highly efficient and stable perovskite solar cells.
