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Wide-Bandgap Perovskite Solar Cell Using a Fluoride-Assisted Surface Gradient Passivation Strategy
Nan Yan1, Yan Gao2, Junjie Yang2
1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, China.
Angewandte Chemie (International Ed. in English)
|January 2, 2023
Summary
Wide-band gap perovskite solar cells (PSCs) efficiency is boosted by passivating defects with fluorinated ammonium salts. This reduces voltage loss, achieving record efficiencies for tandem devices.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Physics
Background:
- Wide-band gap perovskite solar cells (PSCs) are crucial for perovskite/silicon tandem devices.
- Their efficiency is limited by a significant open-circuit voltage (Voc) deficit caused by non-radiative recombination.
- Deep-level acceptor defects are the primary cause of this Voc deficit.
Purpose of the Study:
- To investigate passivation strategies for deep-level acceptor defects in wide-band gap PSCs.
- To enhance the Voc and overall efficiency of PSCs by mitigating non-radiative recombination.
- To explore the use of fluorinated ammonium salts for defect passivation.
Main Methods:
- Theoretical calculations to predict the passivation mechanism of fluorinated ammonium compounds.
- Surface gradient passivation using p-FPEAI (a fluorinated ammonium salt).
- Device characterization to evaluate Voc deficit, efficiency, and performance of flexible and large-area devices.
Main Results:
- Theoretical calculations indicated that fluorinated ammonium enhances electropositivity for defect adsorption.
- Surface gradient passivation with p-FPEAI proved highly effective.
- A record power conversion efficiency (PCE) of 21.63% was achieved for 1.68 eV-band gap inverted PSCs with a minimal Voc deficit of 441 mV.
- Flexible and 1 cm2 opaque PSCs achieved PCEs of 21.02% and 19.31%, respectively.
Conclusions:
- Fluorinated ammonium salt passivation effectively reduces non-radiative recombination and Voc deficit in wide-band gap PSCs.
- Surface gradient passivation with p-FPEAI is a promising strategy for high-efficiency PSCs.
- The developed passivation technique enables high-performance flexible and large-area PSCs, advancing tandem solar cell technology.
