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Interface Field-Effect Passivation Enabled by Selectively Extruded Cations for Printable Mesoscopic Perovskite Solar
Jianhang Qi1, Bolun Zhang1, Yongming Ma1
1Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Key Laboratory of Materials Chemistry for Energy Conversion and Storage of the Ministry of Education, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.
Researchers improved printable mesoporous perovskite solar cells (p-MPSCs) by using tetraphenylphosphonium cations. This strategy passivates defects, enhancing power conversion efficiency (PCE) in hole-transport-layer-free devices.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Mesoporous electron transport layers (ETL) in printable mesoscopic perovskite solar cells (p-MPSCs) are crucial for electron extraction but introduce defects.
- These defects cause non-radiative recombination, limiting power conversion efficiency (PCE).
Purpose of the Study:
- To address interfacial defects in p-MPSCs by implementing an interface field-effect passivation strategy.
- To enhance PCE in hole-transport-layer-free (HTL-free) perovskite solar cells.
Main Methods:
- Incorporation of sterically bulky tetraphenylphosphonium cations into the mesoporous ETL.
- Utilizing spatially selective cation extrusion to form an interfacial electrostatic field.
- Investigating the effect of this field on non-radiative recombination and charge extraction.
Main Results:
- The tetraphenylphosphonium cations migrate to the perovskite/ETL interface, creating a robust electrostatic field.
- This field induces field-effect passivation, suppressing non-radiative recombination.
- Optimized energy alignment enhances charge extraction, leading to a PCE increase from 19.4% to 21.0%.
Conclusions:
- Interface field-effect passivation using cation engineering is a viable strategy for improving HTL-free perovskite solar cells.
- This approach effectively mitigates interfacial defects and boosts device performance.
- The findings highlight the potential for advanced interfacial engineering in perovskite photovoltaics.
