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Published on: February 3, 2021
Defect Passivation with 4-(Trifluoromethyl)Aniline for Efficient and Stable FAPbI3 Quantum Dot Solar Cells
Yueli Liu1,2,3, Zhijie Zheng1, Jianeng Tao1
1State Key Laboratory of Silicate Materials for Architectures, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, P. R. China.
ACS Applied Materials & Interfaces
|June 3, 2026
Summary
A new method uses 4-(trifluoromethyl)aniline (4-ATFB) to stabilize formamidinium lead iodide (FAPbI3) quantum dots (QDs) by passivating defects. This improves solar cell efficiency and stability, overcoming issues with traditional methods.
Area of Science:
- Materials Science
- Nanotechnology
- Photovoltaics
Background:
- Conventional ligand exchange for FAPbI3 quantum dots (QDs) uses polar solvents, negatively impacting stability and device performance.
- Defects in FAPbI3 QDs hinder their efficiency and operational lifespan in solar cell applications.
Purpose of the Study:
- To develop a novel ligand-mediated defect passivation strategy for FAPbI3 QDs using 4-(trifluoromethyl)aniline (4-ATFB).
- To enhance the colloidal stability, carrier dynamics, and overall performance of FAPbI3 QD solar cells.
Main Methods:
- Incorporation of 4-ATFB into a toluene-based solvent system during FAPbI3 QD purification.
- Utilizing the amino group of 4-ATFB for Pb2+ defect passivation and FA+ charge distribution optimization.
- Leveraging the trifluoromethyl group of 4-ATFB to create a moisture barrier for lattice stabilization.
Main Results:
- 4-ATFB treatment effectively passivated defects and stabilized the FAPbI3 QD lattice.
- Significant improvements in carrier dynamics were observed due to reduced defect density and suppressed trap-mediated losses.
- FAPbI3 QD solar cells treated with 4-ATFB achieved a champion power conversion efficiency of 16.33%, surpassing the control device (14.99%).
- Enhanced operational stability was demonstrated, retaining over 80% of initial efficiency after 25 days in ambient conditions without encapsulation.
Conclusions:
- The proposed ligand-mediated defect passivation strategy using 4-ATFB offers a robust method for enhancing FAPbI3 QD stability and performance.
- This approach provides a pathway to overcome limitations of conventional methods, paving the way for more efficient and durable perovskite quantum dot solar cells.
