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All-perovskite tandem solar cells with dipolar passivation
Renxing Lin1, Han Gao2, Jing Lou3
1National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Frontiers Science Center for Critical Earth Material Cycling, Jiangsu Physical Science Research Center, Nanjing University, Nanjing, China. rxlin@nju.edu.cn.
A new dipolar-passivation strategy effectively reduces recombination losses in perovskite solar cells. This breakthrough enhances power conversion efficiency for single-junction and all-perovskite tandem devices.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Non-radiative recombination at the hole transport layer (HTL)/perovskite interface limits power conversion efficiency (PCE) in all-perovskite tandem solar cells.
- Minimizing charge recombination in lead-tin (Pb-Sn) perovskite solar cells is challenging, as traditional passivation methods can impede carrier transport.
Purpose of the Study:
- To develop a novel passivation strategy for the buried interface of narrow-bandgap perovskite solar cells.
- To improve energy-level alignment at the HTL/perovskite interface and reduce trap density.
Main Methods:
- A dipolar-passivation strategy was employed to modify the buried interface of mixed Pb-Sn perovskite.
- This method aimed to enhance ohmic contact, facilitate hole injection, and repel electrons at the HTL/perovskite interface.
Main Results:
- The dipolar passivation extended carrier diffusion length to 6.2 μm.
- Pb-Sn perovskite solar cells achieved a PCE of 24.9% with improved open-circuit voltage (Voc), short-circuit current density (Jsc), and fill factor.
- All-perovskite tandem solar cells reached an outstanding PCE of 30.6% (certified stabilized 30.1%) due to mitigated contact losses.
Conclusions:
- Dipolar passivation is a highly effective strategy for reducing interfacial recombination losses in perovskite solar cells.
- This approach significantly enhances the performance of both single-junction Pb-Sn perovskite solar cells and all-perovskite tandem devices.
- The developed method offers a promising pathway for advancing high-efficiency perovskite-based photovoltaics.
