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Backbone Engineering Enables Highly Efficient Polymer Hole-Transporting Materials for Inverted Perovskite Solar Cells
Xin Wu1, Danpeng Gao1, Xianglang Sun2
1Department of Chemistry, City University of Hong Kong, Kowloon, 999077, Hong Kong.
Advanced Materials (Deerfield Beach, Fla.)
|December 31, 2022
Summary
Researchers developed new polymer hole-transporting materials (HTMs) for perovskite solar cells (PVSCs). These materials improve perovskite film quality, leading to highly efficient and stable devices with record power conversion efficiencies.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- The performance of inverted perovskite solar cells (PVSCs) is critically dependent on the interface and crystallinity of perovskite films.
- The bottom hole-transporting material (HTM) significantly influences these properties.
Purpose of the Study:
- To design and synthesize novel polymer HTMs that enhance the wettability and perovskite film quality.
- To achieve efficient and stable inverted PVSCs through optimized HTM molecular design.
Main Methods:
- Introduction of pyridine units into a polyarylamine backbone to create polymer HTMs.
- Modulation of HTM properties by varying pyridine linkage sites.
- Fabrication and characterization of inverted PVSCs using the developed HTMs.
Main Results:
- The 3,5-linked PTAA-P1 HTM demonstrated a regulated molecular configuration, promoting highly crystalline perovskite films with reduced defect density.
- Dopant-free PTAA-P1 based inverted PVSCs achieved a power conversion efficiency of 24.89% (certified 24.50%) for small areas and 23.12% for large areas.
- Unencapsulated devices retained over 93% of their initial efficiency after 800 hours of stability testing.
Conclusions:
- The developed pyridine-containing polymer HTMs are effective in improving the performance and stability of inverted PVSCs.
- The molecular design of HTMs offers a viable strategy for realizing high-performance perovskite solar cells.
