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Updated: Jul 26, 2025
Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
Dissolved-Cl2 triggered redox reaction enables high-performance perovskite solar cells
Yujie Luo1, Kaikai Liu1, Liu Yang1
1Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing, Institute of Luminescent Materials and Information Displays, College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, P.R. China.
This study introduces a novel method using chlorine-dissolved chloroform to improve perovskite solar cells (PSCs). This technique enhances both efficiency and stability by passivating defects in the bulk and surface of perovskite materials.
Area of Science:
- Materials Science
- Photovoltaics
- Chemistry
Background:
- Perovskite solar cells (PSCs) benefit from 2D/3D heterojunctions for surface passivation.
- Existing methods often fail to address defects within the bulk 3D perovskite layer.
Purpose of the Study:
- To develop a multifunctional solvent for simultaneous 2D/3D heterojunction construction and bulk grain enhancement in PSCs.
- To elucidate the mechanism by which chlorine affects PSC performance and stability.
Main Methods:
- Utilizing chlorine (Cl2)-dissolved chloroform as a solvent for perovskite post-treatment.
- Inducing secondary grain growth and defect passivation through chemical reactions and ionic exchange.
- Forming 2D/3D heterojunctions using hexylammonium bromide.
Main Results:
- Achieved a champion power conversion efficiency of 24.21% in PSCs.
- Demonstrated significantly enhanced thermal, ambient, and operational stability.
- Identified Cl/I ionic exchange and Ostwald ripening as key mechanisms for bulk improvement.
Conclusions:
- The proposed Cl2-dissolved chloroform method effectively passivates bulk and interface defects in PSCs.
- This approach leads to high-performance and highly stable perovskite solar cells.
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