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Updated: May 13, 2026
11:38
Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
18.4K
Ionic Liquid-Assisted Strategy for Morphology Engineering of Inorganic Cesium-Based Perovskite Thin Films Toward
Gulzhan Zhumadil1,2, Menghua Cao3, Yu Han3
1Department of Electrical and Computer Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana 010000, Kazakhstan.
ACS Applied Materials & Interfaces
|October 31, 2024
Summary
Ionic liquid additive [EMIM]+[PF6]- promotes large grain formation in CsPbI2Br perovskite solar cells. This method enhances crystallization, improves film quality, and boosts power conversion efficiency to 17.11%.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Chemistry
Background:
- Wide bandgap CsPbI2Br perovskites are crucial for stable tandem solar cells.
- Perovskite solar cell (PSC) performance relies heavily on perovskite layer quality and crystallization.
- Controlling CsPbI2Br crystallization for uniform morphology and large grains is challenging.
Purpose of the Study:
- To investigate the effect of ionic liquid (IL) [EMIM]+[PF6]- as an additive on CsPbI2Br thin film crystallization.
- To explore how IL incorporation influences film morphology, crystal structure, and optoelectronic properties.
- To enhance the performance and stability of CsPbI2Br-based perovskite solar cells.
Main Methods:
- Incorporation of varying amounts of [EMIM]+[PF6]- ionic liquid into the CsPbI2Br precursor solution.
- Characterization of thin film morphology, crystal structure (XRD), and optical properties (UV-vis, PL).
- Fabrication and performance testing of perovskite solar cells using the modified CsPbI2Br films.
Main Results:
- The ionic liquid [EMIM]+[PF6]- acts as heterogeneous nucleation sites, accelerating crystallization and promoting large grain formation.
- IL incorporation led to red-shifts in UV-vis and PL spectra, indicating changes in electronic band structure.
- Optimized IL content resulted in highly crystalline films with reduced defect density, improved carrier transport, and enhanced morphology.
- CsPbI2Br PSCs with IL additive achieved a power conversion efficiency (PCE) of 17.11% (stabilized 15.87%) and a V_OC of 1.39 V.
- Improved device stability was observed in IL-modified PSCs compared to control devices.
Conclusions:
- Ionic liquid [EMIM]+[PF6]- is an effective additive for controlling CsPbI2Br crystallization and improving film quality.
- This straightforward approach yields highly crystalline CsPbI2Br films with excellent morphology, boosting PSC performance and stability.
- The findings offer valuable advancements for the development of efficient and reproducible Cs-based perovskite solar cells.
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