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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
18.6K
Highly crystalline CsPbI2Br films for efficient perovskite solar cells via compositional engineering
Fang He1,2, Wenzhan Xu1,2, Meng Zhang1,2
1Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University Shenzhen 518000 China weiguodan@sz.tsinghua.edu.cn fykang@sz.tsinghua.edu.cn.
RSC Advances
|May 9, 2022
Summary
Optimizing the precursor ratio of lead iodide (PbI2) and cesium bromide (CsBr) in all-inorganic perovskite solar cells (PSCs) significantly enhances film quality and device performance. An optimal PbI2:CsBr ratio of 1.05:1 yielded a high power conversion efficiency of 13.34% in PSCs.
Area of Science:
- Materials Science
- Photovoltaics
- Solid-State Chemistry
Background:
- All-inorganic CsPbI2Br perovskites offer high thermal stability for perovskite solar cells (PSCs).
- PSC performance is sensitive to film morphology and crystallinity, influenced by precursor ratios, solvents, and annealing.
- Controlling these factors is crucial for efficient PSC fabrication.
Purpose of the Study:
- To investigate the impact of the PbI2:CsBr precursor ratio on CsPbI2Br thin-film properties.
- To optimize the compositional ratio for enhanced morphology, crystallinity, and power conversion efficiency (PCE) in PSCs.
- To fabricate and characterize PSCs with varying PbI2:CsBr ratios.
Main Methods:
- Fabrication of CsPbI2Br thin films using a spin-coating technique with chlorobenzene as an anti-solvent.
- Systematic variation of the PbI2:CsBr molar precursor ratio.
- Characterization of thin-film morphology, crystallinity, and grain size.
- Fabrication and performance testing of complete PSC devices (ITO/SnO2/CsPbI2Br/Spiro-MeOTAD/Au).
Main Results:
- A PbI2:CsBr ratio of 1.05:1 resulted in high-quality CsPbI2Br thin films with improved crystallinity and larger grain sizes.
- The anti-solvent chlorobenzene assisted in achieving superior film formation.
- The optimal precursor ratio significantly enhanced the PCE of the fabricated PSCs.
Conclusions:
- The compositional ratio of PbI2 and CsBr is a critical parameter for optimizing CsPbI2Br perovskite solar cells.
- An optimized PbI2:CsBr ratio of 1.05:1 leads to superior film quality and a maximum PCE of 13.34%.
- This study highlights a simple yet effective method for improving PSC performance through precursor stoichiometry control.
