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N -(2-aminoethyl) Acetamide Additive Enables Phase-Pure and Stable α-FAPbI3 for Efficient Self-Powered Photodetectors
Wenjie Cheng1, Xiang He1, Jian-Gan Wang2
1School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films, Center for Energy Conversion Materials & Physics (CECMP), Soochow University, Suzhou, 215006, China.
Advanced Materials (Deerfield Beach, Fla.)
|October 17, 2022
Summary
Formamidinium-lead triiodide (FAPbI3) perovskite films were improved using N-(2-aminoethyl) acetamide additive. This resulted in high-quality, phase-pure FAPbI3 for stable, high-performance photodetectors.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Formamidinium-lead triiodide (FAPbI3) perovskites are promising for photodetectors due to their narrow bandgap and thermal stability.
- Achieving high-performance photodetectors requires pure-phase α-FAPbI3 with preferred crystal orientation, large grains, and passivated interfaces, which is challenging.
- Current fabrication methods struggle to meet these demanding requirements for optimal device performance.
Purpose of the Study:
- To develop a facile strategy for fabricating high-quality, phase-pure α-FAPbI3 perovskite films.
- To investigate the role of additive engineering in improving perovskite film properties for photodetector applications.
- To demonstrate the enhanced performance and stability of photodetectors based on the modified perovskite films.
Main Methods:
- Additive engineering by introducing N-(2-aminoethyl) acetamide into FAPbI3 perovskite precursors.
- Utilizing chemical and hydrogen bonding to facilitate phase transition and passivate defects.
- Fabrication and characterization of self-powered photodetectors using the optimized FAPbI3 films.
Main Results:
- The addition of N-(2-aminoethyl) acetamide successfully yielded pure-phase α-FAPbI3 perovskite films with improved quality.
- The additive passivated film defects and reduced the phase-transition potential barrier, leading to high-quality films.
- Photodetectors exhibited a maximum responsivity of 0.48 A W⁻¹ at 700 nm and a peak external quantum efficiency of 95% at 440 nm.
- The optimized devices maintained 83% of their initial performance after 576 hours of storage under ambient conditions.
Conclusions:
- A simple and effective additive engineering strategy was established for preparing high-quality, phase-pure α-FAPbI3 perovskite.
- The developed method significantly enhances the performance and stability of FAPbI3-based photodetectors.
- This work offers a feasible approach for advancing perovskite photodetector technology.
