Related Experiment Video
Updated: Aug 5, 2026
Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
Simultaneous Buried and Top-Interface Passivation Enabled by Fluorinated Ionic Liquids for Efficient Inverted
Xin Liu1, Chengguo Liu1, Bo Li1
1Optoelectronic Sensor Devices and Systems Key Laboratory of Sichuan Provincial Universities, Sichuan Meteorological Optoelectronic Sensor Technology and Application Engineering Research Center, Information Materials and Device Applications Key Laboratory of Sichuan Provincial Universities, College of Optoelectronic Engineering (Chengdu IC Valley Industrial College), Chengdu University of Information Technology, Chengdu610225, China.
Ionic liquids (ILs) effectively passivate interfaces in all-inorganic CsPbI2Br perovskite solar cells (PSCs). This dual-surface passivation strategy significantly enhances device performance by reducing energy loss and boosting efficiency.
Area of Science:
- Materials Science
- Photovoltaics
- Nanotechnology
Background:
- All-inorganic CsPbI2Br perovskites show promise for solar cells due to thermal stability and bandgap.
- Interfacial defects and nonradiative recombination limit the efficiency of CsPbI2Br perovskite solar cells (PSCs).
- Existing strategies struggle to address defects at both buried and top interfaces simultaneously.
Purpose of the Study:
- To develop a dual interface engineering strategy using ionic liquids (ILs) for inverted CsPbI2Br PSCs.
- To investigate the distinct effects of IL treatment on the buried (HTL/perovskite) and top (perovskite/ETL) interfaces.
- To achieve simultaneous defect passivation at both interfaces for enhanced photovoltaic performance.
Main Methods:
- Utilized two ionic liquids: 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6) and 1-butyl-3-methylimidazolium hexafluoroantimonate (BMIMSbF6).
- Applied ILs as a dual-surface passivation (DSP) treatment to inverted CsPbI2Br PSCs.
- Systematically characterized the impact of IL modification on device parameters (V_oc, FF, PCE) and interfacial properties.
Main Results:
- BMIMPF6 and BMIMSbSBF6 treatments improved fill factor (FF) and open-circuit voltage (V_oc) by addressing specific interfacial issues.
- The BMIMPF6-based DSP cell achieved a champion power conversion efficiency (PCE) of 15.08%, a 24.5% relative improvement over the control (12.11%).
- BMIMPF6 demonstrated superior defect passivation compared to BMIMSbF6, leading to higher device efficiency.
Conclusions:
- Dual interface engineering with ILs is a viable strategy for high-efficiency inverted CsPbI2Br PSCs.
- Targeted passivation of buried and top interfaces with ILs can mitigate nonradiative recombination.
- This work provides insights into IL-mediated interface modification for advanced perovskite solar cell development.
