Related Experiment Video
Updated: May 16, 2025
Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
Surface Passivation and Energy Alignment Modulation of n-i-p Perovskite Solar Cells with Self-Assembled Molecule
Yuyan Dong1, Ligang Yuan2, Linhui Tang2
1School of Environment and Energy, State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, AIE Institute, South China University of Technology, Guangzhou, 510000, P. R. China.
Abstract:
Perovskite's surface defects trigger deep level traps and energy misalignment, resulting in substantial interface recombination and energy loss in perovskite solar cells (PSCs). Herein, 9-fluoreneacetic acid (FAA), a self-assembled molecule (SAM), is employed to passivate the interface defects and modulate energy alignment. SAM modification reduces the defect density from 6.37 × 1015 to 3.11 × 1015 cm-3 and produces a p-type surface with an upward band bending, thus constructing a well-defined n-i-p heterojunction for efficient charge separation. Accordingly, the target PSC realizes 24.75% power conversion efficiency (PCE) and retains 92% for 1100 h during maximum power point tracking (MPPT) at room temperature. Furthermore, over 80% of initial PCE has been reserved after 2500 h aging in 25-30% relative humidity (RH). This SAM strategy is expected to enhance the efficiency and stability for n-i-p PSCs.
