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Published on: March 19, 2017
Stable and High-Efficiency Perovskite Solar Cells Using Effective Additive Ytterbium Fluoride
Zhigang Li1, Yang Cao1, Jiangshan Feng1
1Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Materials Science and Engineering, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, Institute for Advanced Energy Materials, Shaanxi Normal University, west chang'an street, Xi'an, Shaanxi, 710119, P. R. China.
Introducing ytterbium fluoride (YbF3) into formamidinium (FA)-based perovskite solar cells enhances stability and efficiency. This modification prevents phase transformation and reduces defects, leading to improved device performance and longevity.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Chemistry
Background:
- Formamidinium (FA)-based perovskites offer superior performance over methylammonium (MA) and Cesium (Cs)-based perovskites in solar cells.
- Intrinsic defects in FA-based perovskite films lead to phase instability (yellow δ-phase) at room temperature, hindering development.
Purpose of the Study:
- To enhance the stability and efficiency of FA-based perovskite solar cells.
- To address the phase transformation issue in FA-based perovskite films.
- To improve the overall device performance and operational lifetime.
Main Methods:
- Introduction of ytterbium fluoride (YbF3) into the perovskite precursor solution.
- Partial substitution of Yb3+ for Pb2+ in the perovskite lattice.
- Formation of a YbF3·DMSO Lewis acid complex for defect passivation.
Main Results:
- YbF3 incorporation increased the tolerance factor, facilitating the desired α-phase formation.
- Defect passivation by YbF3·DMSO improved film quality and device stability.
- Achieved a champion power conversion efficiency (PCE) of 24.53%.
- Maintained 90% of initial efficiency after 60 days of air exposure under 30% relative humidity.
Conclusions:
- YbF3 is an effective additive for stabilizing FA-based perovskite films against phase degradation.
- The YbF3 modification significantly enhances both the efficiency and long-term stability of perovskite solar cells.
- This approach presents a promising strategy for the commercialization of high-performance perovskite solar technology.
