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Unveiling Property of Hydrolysis-Derived DMAPbI3 for Perovskite Devices: Composition Engineering, Defect Mitigation,
Yunhe Pei1, Yang Liu1, Faming Li1
1School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China; Center for Applied Chemistry, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China.
Iscience
|May 7, 2019
Summary
This study investigates dimethylammonium lead iodide (DMAPbI3) formation during cesium-based perovskite solar cell fabrication. Optimizing the CsI/DMAPbI3 ratio yields high-quality perovskite films with improved efficiency and stability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Additive engineering is crucial for high-quality perovskite solar cells (PSCs).
- Acid treatment in cesium-based perovskite fabrication may introduce dimethylammonium (DMA+) via solvent hydrolysis.
- The composition and impact of this hydrolysis product on PSC performance require detailed understanding.
Purpose of the Study:
- To investigate the hydrolysis-derived material, DMAPbI3, formed during cesium-based perovskite fabrication.
- To analyze the role of DMAPbI3 in producing high-quality PSCs.
- To optimize CsxDMA1-xPbI3 perovskite films for enhanced device performance and stability.
Main Methods:
- In-depth investigation of the hydrolysis-derived material (DMAPbI3).
- Fabrication of CsxDMA1-xPbI3 perovskite films by varying the CsI/DMAPbI3 precursor ratio.
- Characterization of film morphology, trap state density, and device performance.
Main Results:
- Achieved high-quality CsxDMA1-xPbI3 perovskite films with uniform morphology.
- Demonstrated a low density of trap states and good operational stability.
- Optimized power conversion efficiency reached 14.3%, retaining over 85% efficiency after 20 days in air.
Conclusions:
- The hydrolysis-derived DMAPbI3 plays a significant role in producing high-quality Cs-based perovskite materials.
- Control over the CsI/DMAPbI3 ratio is key to optimizing PSC performance.
- This work provides new insights for advancing Cs-based perovskite solar cell technology.
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